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Castle Kokokuji Castle

This article is in the series Walking the Japanese Castles
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Kokokuji Castle (興国寺城 Kōkokuji-jō, also known as 根古屋城 Negoya-jō) is located in Numazu in Shizuoka Prefecture. It was constructed sometime between 1469 and 1487 and given to Hōjō Soun (or Ise Shinkuro at that time) for services rendered to the Imagawa clan. The rise of the Late Hōjō in the Kantō region began right here.

Kokokuji Castle (興国寺城)

However, the Hōjō did not rule the castle continuously; when Soun invaded the Izu Peninsula in 1491, it was handed over to Imagawa Yoshimoto who later renovated it. In the following decades, the castle changed hands several times between the Imagawa, the Hōjō and the Takeda. The Takeda took control of it in 1571 but lost it to Tokugawa Ieyasu in 1582 when Takeda Katsuyori and his clan were ultimately destroyed. In 1590, Ieyasu had to move to Kantō, and one of Toyotomi Hideyoshi's followers, Nakamura Kazūji (中村 一氏, d. 1600), took residence at Kokōkuji Castle.

After the Battle of Sekigahara, Amano Yasukage (天野 康景, 1537-1613), also known as the "impartial Saburobe", served at the castle. One day, one of Yasukage's samurai killed vassals who were going to steal timber. The shogunate asked Yasukage to hand over his retainers, as the thieves were farmers of the adjacent shogunal demesne. Yasukage, however, convinced that his retainers had acted rightfully, resisted the shogunal order and had to leave the castle in 1607. After that, the domain and Kokōkuji Castle were abandoned. Yasukage died in 1613 at Sainenji Temple in Minamiashigara close to Odawara.

Kokokuji Castle (興国寺城)

We rented a car at Mishima Station and visited Kokōkuji, Nagahama and Nirayama, all castles of the Hōjō clan. I turned to Kokōkuji Castle at the north side of Negoya crossing, along Prefectural Route 22, and parked in front of Homi Shrine.

We had a great view of the main and second enclosures from the third enclosure. The structure of the castle was of renkaku-shiki style (連郭式), where honmaru and ninomaru are arranged side by side, causing the depth of the castle to increase. Still, the sides and rear of the honmaru are exposed, making the castle more vulnerable to attacks on areas other than the central gate. The main enclosure was built on an elevated plateau.

Kokokuji Castle (興国寺城)

Kokokuji Castle (興国寺城)

Stone walls and foundation stones of a yagura, a castle tower.

Kokokuji Castle (興国寺城)

Kokokuji Castle (興国寺城)

The considerably deep dried moat was located on the northern side of the main enclosure. Although the size of the castle was small, with marshes in the east and west, it seems to have been quite a stronghold.

Kokokuji Castle (興国寺城)

The main enclosure seen from the north.

Kokokuji Castle (興国寺城)

The Shinkansen runs along the north side of the castle.

Kokokuji Castle (興国寺城)

Suruga Bay and the Izu Peninsula as seen from the main enclosure. What would have been Hōjō Soun's thoughts on this vista?

Kokokuji Castle (興国寺城)

There are plans to maintain the former castle grounds as a historical park. I suppose that these days there are many places where castles from the Sengoku Period are frantically restored.

Kokokuji Castle (興国寺城)

Date of visit: 30 June 2013

Access Information:

  • Address: Negoya, Numazu-shi, Shizuoka
  • Transportation: 30 minutes from JR Tokaido line Hara station on foot
    10km from Tomei Expressway Numazu IC via Prefectural Route 22


Next article in the series 'Walking the Japanese Castles': Nagahama Castle (Izu)
Previous article in the series 'Walking the Japanese Castles': Kogane Castle
About author
Hiroto Uehara
Hiroto is an ordinary Japanese office worker, but his true mission is searching for castles on the weekend.


I visited today and I found it very lovely and serene, though a bit overgrown right now. What other castles would you recommend in Shizuoka or Izu?

Series table of contents

Iwatsuki Castle Shakujii Castle Oda Castle Tsuchiura Castle Miharu Castle Inohana Castle Setagaya Castle Konodai Castle Usui Castle Sakura Castle Kozukue Castle Masugata Castle Koga Castle Tenjinyama Castle Ogura Castle Sugaya Castle Sugiyama Castle Kogane Castle Kokokuji Castle Nagahama Castle (Izu) Nirayama Castle Hachigata Castle Futagamiyama Castle Edo Castle Kawahara Castle Kageishi Castle Wakasa-Onigajo Castle Tenjinyama Castle (Tottori) Tsuzurao Castle Ueshi Castle Jindaiji Castle Kururi Castle Mariyatsu Castle Narukami Castle Ryozen Castle Kori-Nishiyama Castle Tsutsujigasaki Residence Yogai Castle Kofu Castle Iwadono Castle Hachioji Castle Takiyama Castle Suemori Castle Nagoya Castle Inuyama Castle Kiyosu Castle Tatebayashi Castle Sano Castle Karasawayama Castle Ueda Castle Sanada Residence Sanada Honjo Toishi Castle Katsurao Castle Uchiyama Castle Hiraga Clan Castle Taguchi Castle Tatsuoka Castle Komoro Castle Matsushiro Castle Kajiki Castle Kakuto Castle Hitoyoshi Castle Ichiuji Castle Izaku Castle Chiran Castle Kiyoshiki Castle Kamo Castle Miyakono Castle Obi Castle Shibushi Castle Koyama Castle Mukasa Castle Sadowara Castle Tonokoori Castle Taka Castle Nerima Castle Kawagoe Castle Ashikaga Residence Koizumi Castle Kanayama Castle Shinagawa Battery (Odaiba) Tamba Kameyama Castle Yagi Castle Sonobe Castle Fushimi Castle Yodo Castle Shoryuji Castle Yamazaki Castle Tsukui Castle Katakura Castle Hirayama Castle Site Park Yamanaka Castle Sanuki Castle Sunpu Castle Koyama Castle (Shizuoka) Ryugenzan Castle Sagara Castle Tanaka Castle (Shizuoka) Ishiwaki Castle Hanazawa Castle Mochifune Castle Moriyama Castle (Aichi) Obata Castle (Aichi) Ryusenji Castle Gakuden Castle Komakiyama Castle Iwakura Castle (Aichi) Kano Castle Gifu Castle Kitagata Castle Sone Castle Ōgaki Castle Ōtaki Castle Obata Castle (Ibaraki) Mito Castle Kasama Castle Tanagura Castle Akadate Castle Inawashiro Castle Aizu-Wakamatsu Castle Mukai-Haguroyama Castle

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