2009 in Japan - Incumbents

Incumbents

• Emperor – Akihito
• Prime Minister – Taro Aso (Liberal Democratic Party–Fukuoka) until September 16, Yukio Hatoyama (Democratic Party–Hokkaidō)
• Chief Cabinet Secretary: Takeo Kawamura (L–Yamaguchi) until September 16, Hirofumi Hirano (D–Ōsaka)
• Chief Justice of the Supreme Court: Hironobu Takesaki
• President of the House of Representatives: Yōhei Kōno (L–Kanagawa) until July 21, Takahiro Yokomichi (D–Hokkaidō) from September 16
• President of the House of Councillors: Satsuki Eda (D–Okayama)
• Diet sessions: 171st (regular, January 5 to July 21), 172nd (special, September 16 to September 19), 173rd (extraordinary, October 26 to December 4)