| Ryohei Sugiura
|
[April, 1971 - June, 1971] |
| Hisamichi Matsushita
|
[July, 1971 - March, 1972] |
| Nobuo Katayama
|
[April, 1972 - March, 1973] |
| Shozo Misumi
|
[April, 1973 - March, 1974] |
| Ryohei Takahashi
|
[April, 1974 - March, 1978] |
| Ryukichi Sawada
|
[April, 1978 - February, 1980] |
| Ryohei Takahashi
|
[February, 1980 - July, 1980] |
| Tsugio Sudo
|
[July, 1980 - July, 1982] |
| Ryohei Takahashi
|
[July, 1982 - March, 1986] |
| Kazuya Ohta
|
[April, 1986 - March, 1998] |
| Sadaomi Suzuki
|
[April, 1998 - March, 2004] |
| Hiroshi Shimizu
|
April, 2004 - |