| July 1939 | Hamaji Shoten is founded by Saizaburo Hamaji. |
|---|---|
| September 1955 | Company building is newly built in Awaji-cho, Higashi-ku. |
| July 1960 | Hamaji Sangyo Co., Ltd. is incorporated, with Saizaburo Hamaji as president and representative director. Manufacturing and distribution of lingerie are started. (Capital: 5 million JPY) |
| April 1963 | Headquarters relocated to new building in Morinomiya, Higashi-ku. |
| 1965 | Design and Planning Offices established. |
| 1970 | Hamaji Sangyo starts manufacturing and distributing women’s nightwear and casual wear. |
| 1978 | Hamaji Sangyo starts manufacturing and distributing men’s and children's nightwear. |
| July 1981 | Saizaburo Hamaji resigns as president and becomes chairman. Executive director Yoshiro Hamaji becomes president. |
| Jananuary 1985 | Capital increased to 8 million JPY. |
| December 1985 | Capital increased to 10 million JPY. |
| September 1989 | Capital increased to 20 million JPY. |
| May 1990 | Headquarters building completed in Morinomiya, Chuo-ku. |
| August 1990 | Capital increased to 25 million JPY. |
| September 2005 | Hamaji Industry (Thailand) Co., Ltd. is founded in Thailand. |
| July 2010 | Yoshiro Hamaji resigns as president and becomes chairman. Executive director Masato Hamaji becomes president. |
| June 2021 | Moved the head office to Minami-kyuhojimachi, Chuo-ku. |
