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| Position holders | |||
|---|---|---|---|
| Holder | Start date | End date | |
| Shin'ya Totsuka Politician | - | - | |
| Tatsuya Ono Politician | - | - | |
| Toshiko Ono Politician | - | - | |
| Takashige Hiraga Politician | - | - | |
| Shu Watanabe Politician | - | - | |
| Kentarō Genma Politician | - | - | |
| Masaomi Koike Politician | - | - | |
| Morio Sugiyama Politician | - | - | |
| Yukihiro Endō Politician | - | - | |
| Hiromi Tsukuda Politician | - | - | |
| Seishū Makino Politician | - | - | |
| Hiromichi Nakano Politician | - | - | |
| Shingo Amano Politician | - | - | |
| Yoshihiko Yamashita Politician | - | - | |
| Zenkichi Kojima Politician | - | - | |
| Hidetada Sudō Politician | - | - | |
| Hajime Amano Politician | - | - | |
| Matsui Saburo Politician | - | - | |
| Kiyoshi Nishina Politician | - | - | |
| Tōru Unno Politician | - | - | |
| Takeshi Toyooka Politician | - | - | |
| Yōichi Fukazawa Politician | - | - | |
| Kimihiko Nakazawa Politician | - | - | |
| Toshitaka Ōoka Politician | - | ||
| Shigeki Nishihara Politician | - | - | |
| Takao Makino Politician | - | - | |
| Toshitaka Ōoka Politician | - | ||
| Hiroyasu Kurihara Politician | - | - | |