Castle Hikone Castle

Hikone Castle stands in the city of Hikone, Shiga Prefecture, on the eastern shore of Lake Biwa (琵琶湖 Biwa-ko). Built during the early Edo period, it served as the seat of the Ii clan (井伊氏), one of the most powerful hereditary vassal families of the Tokugawa shogunate. The castle remained the administrative centre of Hikone Domain throughout the Edo period and was home to fourteen successive generations of Ii lords.

The castle occupies Mount Hikone, a low hill rising to approximately 50 metres above the surrounding plain. Because the hill was also known as Mount Konkisan (金亀山), the castle was sometimes called Konkijō (金亀城), or "Golden Turtle Castle". Its position was of considerable strategic importance. Situated near the junction of the Nakasendō and Hokurikudō routes and overlooking communications across Lake Biwa, it controlled one of the principal approaches between eastern and western Japan.

Today Hikone Castle is recognised as one of the country's most important historic castles. Its keep, attached turret, and connecting tamon turret are designated National Treasures, while several other gates and turrets have been designated Important Cultural Properties. The castle grounds are protected as a Special Historic Site, and the adjacent Genkyū-en and Rakuraku-en gardens are designated Places of Scenic Beauty. Together they preserve an unusually complete picture of a daimyō stronghold and residence from the seventeenth century.

History

The origins of Hikone Castle lie in the aftermath of the Battle of Sekigahara in 1600. Following Tokugawa Ieyasu's victory, Ii Naomasa (井伊直政, 1561–1602), one of the Tokugawa Four Heavenly Kings (徳川四天王), was rewarded with extensive lands in northern Ōmi Province. He took possession of Sawayama Castle (佐和山城), the former stronghold of Ishida Mitsunari (石田三成, 1560–1600), one of the principal commanders of the defeated Western Army.

Although Sawayama Castle was widely regarded as an excellent fortress, tradition holds that Naomasa disliked both its medieval layout and its close association with Mitsunari. He therefore planned to establish a new seat of power closer to Lake Biwa. The project was interrupted by his death in 1602 from wounds sustained during the Sekigahara campaign, but his retainers carried forward his plans.

Construction of Hikone Castle began in 1604 under the direction of Ii Naokatsu (井伊直勝, 1590–1662), Naomasa's son and successor. The project was undertaken as a major tenka-bushin (天下普請), a large-scale public works programme organised by the Tokugawa shogunate. Daimyō from several provinces were ordered to contribute labour and resources. The keep was completed around 1606–1607, while work on the wider castle complex continued for almost two decades. The entire castle, including its outer defences and palace buildings, was finally completed in 1622.

Like many early Edo-period castles, Hikone incorporated structures and materials taken from older fortresses. Tradition holds that the keep originated as part of Ōtsu Castle (大津城), while the Tenbin Yagura (天秤櫓) was transferred from Nagahama Castle (長浜城). Other buildings and large quantities of stone were reused from Sawayama Castle and nearby fortifications that were abandoned following the implementation of the Tokugawa policy limiting domains to a single castle.

The Ii clan prospered under Tokugawa rule. By 1633, the domain had reached an income of 350,000 koku, making it the wealthiest of the hereditary vassal domains. Several members of the family later served as tairō (大老), the highest office below the shōgun. The most famous was Ii Naosuke (井伊直弼, 1815–1860), who played a central role in the opening of Japan to the West during the final years of the shogunate.

Unlike many Japanese castles, Hikone escaped destruction during the Meiji period. Following the Restoration, castles throughout the country were dismantled or sold for building materials. Hikone's structures were initially retained under military control, but demolition was later proposed. During Emperor Meiji's visit to the region in 1878, influential statesman Ōkuma Shigenobu (大隈重信, 1838–1922) reportedly appealed for the preservation of the castle. As a result, the keep and principal structures survived, allowing Hikone to become one of the few castles in Japan to retain its original early Edo-period architecture.

By the twentieth century, the castle had become an important cultural monument. Major restoration campaigns were carried out during the Shōwa and Heisei eras, ensuring the preservation of its historic buildings while maintaining their original appearance and construction techniques.

Layout and Defences

Hikone Castle is a hirayamajiro (平山城), or hilltop castle, built on Mount Hikone and surrounded by an extensive system of moats, baileys, and defensive enclosures. Originally, the castle stood much closer to Lake Biwa than it does today. Before modern land reclamation, the lake's waters extended almost to the foot of the castle hill, strengthening its natural defences and enhancing its strategic position along one of Japan's principal transport routes.

Three concentric moats protected the castle. The innermost moat (uchibori, 内堀) enclosed the central fortifications, while a middle moat (nakabori, 中堀) surrounded the castle's main compounds. Beyond these lay a vast outer moat system, much of which disappeared during modern urban development. Together with artificial waterways and the castle town, these defences formed a large fortified complex extending far beyond the surviving castle grounds.

At the heart of the castle stands the Honmaru (本丸), or main bailey, which occupies the highest part of the hill. To the west lies the Nishi-no-maru (西の丸). At the same time, subsidiary enclosures such as Kane-no-maru (鐘の丸), Taiko-maru (太鼓丸), and Yamasaki Kuruwa (山崎曲輪) occupy the surrounding slopes. The lord's palace was located within the Ninomaru (二の丸), from where domain administration was conducted throughout the Edo period.

Approaching the castle required passing through a carefully designed sequence of gates, bridges, and enclosed spaces. Rather than providing a direct route to the keep, the approaches forced visitors to make repeated turns as they passed through multiple defensive checkpoints. Such arrangements slowed attackers, exposed them to fire from above, and prevented the use of large assault formations.

One of the most impressive defensive features is the Tenbin Yagura (天秤櫓), which guards the principal route to the Honmaru. Positioned above a deep dry moat crossed by the Rōka-bashi (廊下橋), or Covered Bridge, the structure consists of a central gate flanked by matching corner turrets. Viewed from the front, the arrangement resembles a traditional balance scale, hence the name "Tenbin", meaning "balance". Beyond it stands the Taikomon Yagura (太鼓門櫓), the final gate protecting the entrance to the Honmaru and the keep beyond.

The castle also preserves a rare example of nobori-ishigaki (登り石垣), or "climbing stone walls". These walls run up the hillside, linking lower and upper defensive positions. Such structures survive at only a handful of Japanese castles and were designed to prevent attackers from moving freely along the slopes or bypassing the main fortifications. At Hikone they remain among the best-preserved examples in the country.

Another distinctive feature is the extensive use of stone revetments. Different masonry techniques can still be observed throughout the castle. At the Tenbin Yagura, for example, the stone foundations reveal both original early seventeenth-century construction and later Edo-period repairs, allowing visitors to compare changing approaches to castle engineering.

Although the castle's military role diminished during the long peace of the Edo period, its defensive design remained largely intact. As a result, Hikone today offers one of the clearest surviving examples of how an early Edo-period stronghold combined natural terrain, engineered defences, and carefully controlled approaches to create a formidable fortress.

The Keep (Tenshu)

The keep of Hikone Castle is one of Japan's most celebrated castle towers and one of only five castle keeps designated as a National Treasure. Completed around 1606–1607, it stands at the centre of the Honmaru and remains the visual focal point of the entire castle complex.

Although modest in size compared with the keeps of Himeji or Matsumoto, the Hikone tenshu is widely admired for the sophistication of its design. The structure is a three-storey, three-roofed keep with an additional basement level, combining defensive practicality with an unusually elegant exterior. Built atop a massive stone foundation, it commands extensive views over the surrounding plain and Lake Biwa.

Architecturally, the keep belongs to the bōrō-gata (望楼型), or watchtower style, associated with the transition from the turbulent Sengoku period to the more stable early Edo era. The upper watchtower rises above a lower structure, creating a compact but highly distinctive silhouette. Unlike later keeps, which often employed continuous vertical support pillars, Hikone's keep was constructed floor by floor, reflecting an older building technique.

One of its most striking features is the wide variety of gables incorporated into the exterior. Irimoya (入母屋), kirizuma (切妻), chidori (千鳥), and karahafu (唐破風) gables are combined to create a lively, asymmetrical appearance. Decorative metal fittings, white plaster walls, and black wooden cladding further contribute to the keep's visual appeal.

The keep is also notable for its unusually large number of katō-mado (花頭窓), cusped windows derived from Zen Buddhist architecture. While such windows are often confined to the uppermost levels of Japanese castle keeps, Hikone employs them extensively, including on the second floor. This contributes to the building's refined appearance while distinguishing it from most other surviving keeps.

At the top of the structure is a railed balcony encircling the highest storey. Although it resembles an observation platform, it was primarily decorative and was not intended for practical use. The feature reflects the growing ceremonial and symbolic role of castles during the early Edo period, when they increasingly served as expressions of lordly authority as well as military strongholds.

Evidence uncovered during twentieth-century restoration work strongly supports the long-held tradition that the keep was relocated from Ōtsu Castle (大津城). Components from an earlier structure were identified within the building fabric, suggesting that the upper portion of the present keep originated elsewhere and was later adapted for use at Hikone. The reuse of buildings and materials was common during the early Edo period, allowing construction to proceed more quickly while preserving valuable resources.

The keep's interior retains numerous defensive features. Hidden loopholes for archers and musketeers are incorporated into the walls, while the steep stairways and compartmentalised layout would have hindered intruders in the event of an attack. Yet despite these martial elements, the overall impression is one of elegance rather than intimidation. This balance between military function and architectural refinement is one reason Hikone Castle is often regarded as having one of the most beautiful keeps in Japan.

Together with its attached turret (付櫓 tsuke-yagura) and connecting tamon turret (多聞櫓 tamon-yagura), the keep forms the National Treasure complex that has become the enduring symbol of Hikone Castle.

Important Surviving Structures

While the National Treasure keep is the castle's most famous feature, Hikone Castle's exceptional state of preservation owes much to its surviving gates, turrets, and ancillary buildings. Together, these structures provide a rare opportunity to study the architecture and defensive arrangements of an early Edo-period castle in considerable detail.

Taikomon Yagura (太鼓門櫓)

The Taikomon Yagura, or Drum Gate Tower, guards the entrance to the Honmaru and forms the final gateway before the keep. Designated an Important Cultural Property, it consists of a turret gate connected to a long adjoining turret.

The structure is notable for its unusual design. Unlike most surviving turret gates, the rear side is open and incorporates a corridor with railings. The reason for this arrangement remains uncertain. One theory suggests that it allowed the sound of a drum once housed within the tower to carry more effectively throughout the castle, giving rise to the name "Taikomon", or Drum Gate.

Investigations carried out during restoration work revealed that the structure had been relocated from another large gate, either from a castle or a temple complex. Such transfers were common during the construction of Hikone Castle and reflect the extensive reuse of earlier buildings throughout the complex.

Tenbin Yagura (天秤櫓)

The Tenbin Yagura is one of Hikone Castle's most distinctive buildings. It serves as a symbol of the castle almost as recognisable as the keep itself. Standing above a deep dry moat and linked to Kane-no-maru by the Covered Bridge (廊下橋 Rōka-bashi), it controlled one of the principal approaches to the Honmaru.

Its name, meaning "Balance Turret", derives from its unique appearance. A central gatehouse is flanked by matching two-storey corner turrets connected by a tamon turret, creating a symmetrical form reminiscent of a traditional weighing scale. According to clan records, the structure was transferred from Nagahama Castle.

The stone foundations beneath the turret are particularly interesting. The right-hand side preserves the original early seventeenth-century masonry, while the left-hand side was rebuilt during major repairs carried out in 1854. The two sections employ different stone-laying techniques, allowing visitors to observe the evolution of Japanese castle engineering over more than two centuries.

Nishi-no-maru Sanjū Yagura (西の丸三重櫓)

Occupying the north-west corner of the Nishi-no-maru, the Nishi-no-maru Sanjū Yagura is a three-storey watchtower that once protected the castle's western rear approaches. Together with its attached turrets, it forms one of the most imposing surviving structures within the castle grounds.

Historical records indicate that the tower was entrusted to the Kimata family, the Ii clan's chief retainers. The head of the family reportedly spent part of each month performing official duties within the tower, illustrating how castles often served administrative as well as military functions during the Edo period.

Tradition maintains that the structure originated at Odani Castle (小谷城), the former stronghold of the Azai clan, although definitive proof has not survived. Significant alterations were carried out in 1853, and the building's present appearance differs somewhat from its original form.

Sawaguchi Tamon Yagura (佐和口多聞櫓)

The Sawaguchi Tamon Yagura stands beside the former Sawaguchi entrance, one of the principal gateways through the castle's middle moat. Extending along the approach lined with the famous Iroha-matsu pines (いろは松), it formed part of an extensive gate complex that controlled access to the castle's inner precincts.

The surviving structure consists of a long tamon turret terminating in a two-storey corner tower. Originally it was connected to additional gate buildings, creating a fortified masugata (枡形) gate arrangement. Much of the complex was dismantled during the early Meiji period, but the remaining turret survives as an Important Cultural Property.

The present building dates from a reconstruction carried out between 1769 and 1771 after a fire destroyed the earlier structure. Nearby are some of Hikone Castle's best-preserved examples of nobori-ishigaki, the rare climbing stone walls that ascend the hillside and strengthen the castle's defences.

Umaya (馬屋)

Among Hikone Castle's most unusual surviving buildings is its large stable. Designated an Important Cultural Property in 1963, it is one of the few substantial castle stables remaining in Japan and is often regarded as unique in both scale and preservation.

The building stands beyond the Sawaguchi Tamon Yagura and retains accommodation for twenty-one horses, together with facilities for their care and management. Constructed with a shingled roof and timber framework, it provides a rare glimpse into an aspect of castle life that has disappeared almost everywhere else.

While keeps and gates often dominate attention, the Umaya illustrates the practical realities of maintaining a daimyo household. Horses remained essential for transport, communication, and ceremonial processions throughout the Edo period, and the survival of the stable adds significantly to Hikone Castle's value as a complete historical complex.

Genkyū-en and Rakuraku-en

To the north of the castle lies one of Hikone's greatest treasures: the combined garden and villa complex known as Genkyū-en and Rakuraku-en (玄宮楽々園). Designated a Place of Scenic Beauty, the complex preserves an important aspect of daimyo life that has disappeared at many other castle sites. While the castle itself reflects military and administrative authority, the gardens and villa reveal how the lords of Hikone entertained guests, practised the arts, and enjoyed the cultivated pursuits expected of the warrior elite.

Genkyū-en (玄宮園) is a large kaiyū-shiki teien (回遊式庭園), or strolling garden, laid out around a central pond. The garden is traditionally said to have been created in 1677 by Ii Naooki (井伊直興, 1656–1717), the fourth lord of Hikone. Inspired by the celebrated Eight Views of Ōmi (近江八景), the design incorporates islands, bridges, winding paths, and carefully composed viewpoints that encourage visitors to experience the landscape from multiple perspectives.

Several pavilions once stood around the pond, including Rinchi-kaku (臨池閣) and Hōshō-dai (鳳翔台), from which guests could admire the scenery and enjoy formal gatherings. Four teahouses were formerly distributed throughout the grounds, and the garden's layout suggests it served as an important venue for social and cultural events centred on the tea ceremony. The paths lead visitors naturally from one scenic point to another, revealing changing views of water, islands, and the castle itself.

One of the most celebrated vistas in Hikone is the view of the castle keep rising above the trees and pond of Genkyū-en. This composition, in which the National Treasure keep appears as part of the garden landscape, remains one of the defining images of Hikone Castle.

Adjacent to the garden stands Rakuraku-en (楽々園), a villa and retirement residence that was formerly known as the Keyaki Palace (槻御殿 Keyaki Goten). The complex served as a secondary residence for the Ii family and was used both as a retreat and for receiving distinguished guests. Although only part of the original estate survives, it remains one of the few examples of a daimyo's villa directly associated with a major castle.

The present buildings include the entrance hall, the audience chambers, the Goshoin (御書院), the Jishin-no-ma (地震の間), and the celebrated Rakuraku-no-ma (楽々の間), from which the villa takes its current name. During the retirement of Ii Naonaka (井伊直中, 1794–1850), however, the residence was considerably larger, extending over an area many times its size today.

The gardens immediately surrounding Rakuraku-en differ in character from those of Genkyū-en. Rather than a strolling garden, they were designed to be viewed from the buildings themselves. Carefully arranged ponds, stonework, and plantings create framed compositions that incorporate the distant Suzuka Mountains as borrowed scenery (借景 shakkei).

Rakuraku-en also preserves evidence of the cultural life of the Hikone domain. Within the villa grounds stands a Noh stage (能舞台), reflecting the importance of Noh theatre among the warrior aristocracy. Stone water basins (蹲踞 tsukubai), ornamental ponds, and other garden features reveal the influence of tea culture and refined aesthetic traditions that flourished under the patronage of the Ii family.

The complex also has an important connection to Ii Naosuke (井伊直弼, 1815–1860), the most famous lord of Hikone. Born in the Keyaki Palace as the son of the retired eleventh lord, Ii Naonaka, Naosuke spent his early years within this environment of gardens, scholarship, and artistic pursuits. The cultural education he received here would later influence both his intellectual development and his political career.

Together, Genkyū-en and Rakuraku-en complement the castle's military architecture by preserving the residential, ceremonial, and cultural world of the Hikone domain. Few castle sites in Japan retain such an extensive and interconnected landscape, making the complex an essential part of Hikone Castle's historical significance.

Hikone Castle Museum

Opened in 1987, the Hikone Castle Museum (彦根城博物館) stands on the site of the former Omote Goten (表御殿), the official palace where the lords of Hikone conducted administrative and ceremonial affairs. The museum complex incorporates reconstructed palace buildings, including reception rooms and a Noh stage, offering visitors a glimpse of the environment in which the Ii family governed the domain.

The museum houses the treasures and historical records of the Ii clan, including armour, swords, helmets, tea utensils, Noh costumes, furnishings, paintings, and documents related to the history of Hikone Domain. Among its most important holdings is the celebrated Hikone Screen (彦根屏風), a National Treasure depicting scenes from early Edo-period urban life. The collections provide valuable insight into both the martial traditions and the cultural pursuits of one of the Tokugawa shogunate's most influential daimyo families.

Particularly noteworthy are the displays relating to the Ii family's famous Red Armour tradition (井伊の赤備え), as well as exhibitions illustrating the clan's involvement in tea culture, Noh theatre, and domain administration. Together with the surviving castle buildings, Genkyū-en, and Rakuraku-en, the museum helps present Hikone Castle not merely as a fortress, but as the political, cultural, and ceremonial centre of the Hikone domain.

Ii Naosuke and the Umoregiya

Few figures associated with Hikone Castle are as well known as Ii Naosuke (井伊直弼, 1815–1860), the thirteenth lord of Hikone and one of the most influential statesmen of the late Tokugawa period. As tairō (大老), he played a central role in the shogunate's response to growing foreign pressure. He was instrumental in concluding treaties that opened Japan to international trade. His policies, however, made him a deeply controversial figure, and he was assassinated by anti-shogunate samurai in the Sakuradamon Incident of 1860.

Naosuke's early life was far removed from the political prominence he would later achieve. Born at the Keyaki Palace (槻御殿) within what is now Rakuraku-en, he was the fourteenth son of Ii Naonaka (井伊直中, 1794–1850), the eleventh lord of Hikone. With little prospect of succession, he spent much of his youth in relative obscurity.

From the age of seventeen, Naosuke lived in a modest residence known as the Umoregiya (埋木舎), literally the "House of the Buried Tree". The name derives from a poem expressing his belief that he might spend his entire life hidden from public view, like a buried piece of timber never destined to flourish. Rather than surrendering to despair, however, he devoted himself to study and self-cultivation.

During his years at the Umoregiya, Naosuke pursued Zen Buddhism, martial arts, Noh and Kyōgen theatre, classical Japanese studies, poetry, ceramics, and, above all, the tea ceremony. The intellectual and cultural foundations he developed during this period profoundly shaped his character and later political career.

The Umoregiya survives today near the castle grounds and remains one of the most important historic sites associated with the final decades of the Tokugawa shogunate. Together with Hikone Castle and Rakuraku-en, it provides valuable insight into the formative years of one of the most consequential figures in nineteenth-century Japanese history.

World Heritage Status

Hikone Castle was placed on Japan's World Heritage Tentative List in 1992 and remains one of the country's leading candidates for future inscription. Unlike many castle nominations, efforts to secure World Heritage status have focused not only on the keep and fortifications but also on the broader cultural landscape, including the gardens, former castle town, and surviving evidence of domain administration.

In recent years, researchers have increasingly presented Hikone Castle as a symbol of the peaceful order established under the Tokugawa shogunate. UNESCO's advisory bodies have acknowledged the site's potential significance while encouraging further refinement of the nomination's international context and comparative framework. As of 2026, Hikone Castle remains on Japan's Tentative List and continues to be considered for future nomination.

Hikone Castle Album:

References:

• Coaldrake, William H., Architecture and Authority in Japan, London: Routledge, 1996.
• Hinago, Motohiko, Japanese Castles, Tokyo: Kodansha International, 1986.
• Matsuoka, Susumu, Hikone Castle, Tokyo: Gakken, 2007.
• Paine, Robert Treat, and Alexander Soper, The Art and Architecture of Japan, New Haven: Yale University Press, 1981.
• Pitelka, Morgan, ed., Handbook to Life in Medieval and Early Modern Japan, New York: Oxford University Press, 2009.
• Yamamura, Kozo, ed., The Cambridge History of Japan, Volume 4: Early Modern Japan, Cambridge: Cambridge University Press, 1991.

Links: