2010 in Japan
Events in the year 2010 in Japan. == Incumbents == Emperor – Akihito Prime Minister – Yukio Hatoyama (Democratic Party–Hokkaidō) until June 8, Naoto Kan (Democratic Party–Tokyo) Chief Cabinet Secretary: Hirofumi Hirano (D–Ōsaka) until January 7, Yoshito Sengoku (D–Tokushima) Chief Justice of the Supreme Court: Hironobu Takesaki President of the House of Representatives: Takahiro Yokomichi (D–Hokkaidō) President of the House of Councillors: Satsuki Eda (D–Okayama) until July 25, Takeo Nishioka (D–proportional) from July 30 Diet sessions: 174th (regular, January 18 to June 16), 175th (extraordinary, July 30 to August 6), 176th (extraordinary, October 1 to December 3) === Governors === Aichi Prefecture: Masaaki Kanda Akita Prefecture: Norihisa Satake Aomori Prefecture: Shingo Mimura Chiba Prefecture: Kensaku Morita Ehime Prefecture: Moriyuki Kato (until 30 November); Tokihiro Nakamura (starting 1 December) Fukui Prefecture: Issei Nishikawa Fukuoka Prefecture: Wataru Asō Fukushima Prefecture: Yūhei Satō Gifu Prefecture: Hajime Furuta Gunma Prefecture: Masaaki Osawa Hiroshima Prefecture: Hidehiko Yuzaki Hokkaido: Harumi Takahashi Hyogo Prefecture: Toshizō Ido Ibaraki Prefecture: Masaru Hashimoto Ishikawa Prefecture: Masanori Tanimoto Iwate Prefecture: Takuya Tasso Kagawa Prefecture: Takeki Manabe (until 4 September); Keizō Hamada (starting 5 September) Kagoshima Prefecture: Satoshi Mitazono Kanagawa Prefecture: Shigefumi Matsuzawa Kochi Prefecture: Masanao Ozaki Kumamoto Prefecture: Ikuo Kabashima Kyoto Prefecture: Keiji Yamada Mie Prefecture: Akihiko Noro (until 20 April); Eikei Suzuki (starting 21 April) Miyagi Prefecture: Yoshihiro Murai Miyazaki Prefecture: Hideo Higashikokubaru Nagano Prefecture: Jin Murai (until 31 August); Shuichi Abe (starting 1 September) Nagasaki Prefecture: Genjirō Kaneko (until 1 March); Hōdō Nakamura (starting 2 March) Nara Prefecture: Shōgo Arai Niigata Prefecture: Hirohiko Izumida Oita Prefecture: Katsusada Hirose Okayama Prefecture: Masahiro Ishii Okinawa Prefecture: Hirokazu Nakaima Osaka Prefecture:Tōru Hashimoto Saga Prefecture: Yasushi Furukawa Saitama Prefecture: Kiyoshi Ueda Shiga Prefecture: Yukiko Kada Shiname Prefecture: Zenbe Mizoguchi Shizuoka Prefecture: Heita Kawakatsu Tochigi Prefecture: Tomikazu Fukuda Tokushima Prefecture: Kamon Iizumi Tokyo: Shintarō Ishihara Tottori Prefecture: Shinji Hirai Toyama Prefecture: Takakazu Ishii Wakayama Prefecture: Yoshinobu Nisaka Yamagata Prefecture: Mieko Yoshimura Yamaguchi Prefecture: Sekinari Nii Yamanashi Prefecture: Shōmei Yokouchi == Events == January 1 – The towns of Nijō and Shima merged with the city of Maebaru to form the city of Itoshima.