| January, 1948 |
Limited company Kameda Hospital established, Representative Dr. Toshio Kameda. |
| August, 1954 |
Medical Foundation Tesshokai established, Chairman of the Board Dr. Toshio Kameda. |
| September, 1967 |
Chairman of the Board Dr. Toshio Kameda, retires Chairman of the Board Dr. Toshitaka Kameda, Inaugurated |
| July, 1991 |
Chairman of the Board Dr. Toshitaka Kameda, retires Chairman of the Board Dr. Toshitada Kameda, Inaugurated |
| July, 2008 |
Chairman of the Board Dr. Toshitada Kameda, retires Chairman of the Board Dr. Takaaki Kameda, Inaugurated |