He joined the retailer Ito-Yokado in 1963 and was involved in establishing York Seven, which later became Seven-Eleven Japan. The first convenience store in the country was a 7-Eleven that opened in Tokyo's Toyosu area in 1974. Seven & i Holdings, centred on 7-Eleven, has become one of Japan's leading retail groups, encompassing supermarkets, department stores and restaurants. Under Suzuki's leadership, the company introduced a series of new services in convenience stores, including POS (point-of-sale) systems, ATM services, and utility bill payment functions. He stepped down as chairman and CEO in 2016, taking responsibility after a group personnel plan he had led was rejected. He assumed the role of honorary adviser.