Commission on the Constitution

Commission on the Constitution

(As of September 8,2025)


The Commission on the Constitution conducts wide-ranging and integrated research on the Constitution of Japan and basic laws closely related to the Constitution of Japan, and conducts deliberations on bills to amend the Constitution, initiations of amendments related to the Constitution of Japan and bills related to a national referendum.

Title Name Political Groups
Chairman NAGAHAMA Hiroyuki CDP
Director USUI Shoichi LDP
Director FUJIKAWA Masahito LDP
Director YAMAMOTO Keisuke LDP
Director WAKABAYASHI Yohei LDP
Director KUMAGAI Hiroto CDP
Director TSUJIMOTO Kiyomi CDP
Director KAWAI Takanori DPFP-SR
Director ITO Takae KP
Director KATAYAMA Daisuke JIP
Director ADACHI Yuji SAN
  AOYAMA Shigeharu LDP
  KAJIHARA Daisuke LDP
  KATAYAMA Satsuki LDP
  KATO Akiyoshi LDP
  KOSHO Harutomo LDP
  KOBAYASHI Kazuhiro LDP
  NAKANISHI Yusuke LDP
  NISHITA Hidenori LDP
  HIGASHINO Hideki LDP
  FUJIKI Shinya LDP
  MATSUKAWA Rui LDP
  MATSUSHITA Shimpei LDP
  YAMAMOTO Sachiko LDP
  YOSHII Akira LDP
  WAKAI Atsuko LDP
  UCHIKOSHI Sakura CDP
  OZAWA Masahito CDP
  KONISHI Hiroyuki CDP
  TAJIMA Maiko CDP
  FUKUSHIMA Mizuho CDP
  ADACHI Yasushi DPFP-SR
  UEDA Kiyoshi DPFP-SR
  MIZUNO Koichi DPFP-SR
  YAMADA Yoshihiko DPFP-SR
  SASAKI Masafumi KP
  TANIAI Masaaki KP
  HIRAKI Daisaku KP
  ASADA Hitoshi JIP
  SHIBATA Takumi JIP
  MATSUZAWA Shigefumi JIP
  SHIOIRI Sayaka SAN
  MIYADE Chisato SAN
  YAMAZOE Taku JCP
  YAMAMOTO Taro

The names of the political groups in the house, have been abbreviated on this page using unofficial abbreviations. 'None' indicates the house member who is not affiliated with a political group. For the official names of the political groups, please click here.