He was from the former town of Gokashō, now part of Higashiōmi, in Shiga Prefecture. He enlisted in the Imperial Japanese Army in 1940 and fought in Battle of Imphal during the Burma Campaign of the Pacific War, aged only 19. He was demobilized 3 years later at age 21.
In 1968, at an event held by the Japanese industrialist Kōnosuke Matsushita to celebrate the hundred years anniversary of the Meiji Restoration, he met the composer Toshiro Mayuzumi. He had a three decade friendship with him and attended his memorial on May 29, 1997.
In 1946, he founded his own company in Kyoto, which made women's underwear such as bras, girdles, and nightgowns. His company became global after obtaining its current name (Wacoal) in 1957, with subsidiaries in United States, France, China, Singapore, Vietnam, and Thailand. He was a recipient of the Order of the Sacred Treasure. In 1998, the year of his death, his company had a net income of 8.2 billion Japanese yen ($61.2 million US) with sales of 170 billion yen ($1.2 billion US). His son, Yoshikata Tsukamoto, is the current chairman and president of Wacoal.
| President of Nippon Kaigi
- "Tsukamoto Kōichi". 20-seiki Nihon jinmei jiten (in Japanese). Nichigai Associates. Retrieved 3 January 2016.
- "Koichi Tsukamoto, 77, Japanese Clothier". New York Times. June 11, 1998. Retrieved 3 January 2016.
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