| Name | In-House Group | Constituency/Area |
|---|---|---|
| WADA Masamune | SAN | Tohoku Bloc |
| WADA Yoshiaki | LDP | Hokkaido 5th District |
| WAKABAYASHI Kenta | LDP | Nagano 1st District |
| WAKAMIYA Kenji | LDP | Tokyo 5th District |
| WAKASA Kiyoshi | JIP | Hokuriku-Shinetsu Bloc |
| WAKAYAMA Shinji | LDP | Aichi 10th District |
| WASEDA Yuki | CRA | Minami Kanto Bloc |
| WASHIO Eiichiro | LDP | Niigata 4th District |
| WATANABE Airi | SAN | Tokai Bloc |
| WATANABE Hiromichi | LDP | Chiba 6th District |
| WATANABE Katsuyuki | LDP | Miyagi 2nd District |
| WATANABE Koichi | LDP | Hokkaido Bloc |
| WATANABE Shintaro | Ind | Tochigi 3rd District |
| WATANABE So | CRA | Miyazaki 1st District |
Notes:
List of the In-House Groups in the House
District: Single-seat constituency
Bloc: Proportional representation area
In-House Group: A group of House Members who engage in joint activities within the House. Usually, a political party forms an in-House group inside the House, but occasionally there are cases where a group is formed by (1) House Members who do not belong to a particular political party, (2) a political party and a House Member or Members who do not belong to any political party, or (3) two or more political parties.