Constitution:
3 May 1947
Legal system:
modeled after German civil law system with English-American influence; judicial review of legislative acts in the Supreme Court; accepts compulsory ICJ jurisdiction with reservations
Suffrage:
20 years of age; universal
Executive branch:
chief of state: Emperor AKIHITO (since 7 January 1989) head of government: Prime Minister Taro ASO (since 24 September 2008) cabinet: Cabinet appointed by the prime minister elections: Diet designates prime minister; constitution requires that prime minister commands parliamentary majority; following legislative elections, leader of majority party or leader of majority coalition in House of Representatives usually becomes prime minister; monarch is hereditary
Legislative branch:
bicameral Diet or Kokkai consists of the House of Councillors or Sangi-in (242 seats - members elected for six-year terms; half reelected every three years; 146 members in multi-seat constituencies and 96 by proportional representation) and the House of Representatives or Shugi-in (480 seats - members elected for four-year terms; 300 in single-seat constituencies; 180 members by proportional representation in 11 regional blocs) elections: House of Councillors - last held 29 July 2007 (next to be held in July 2010); House of Representatives - last held 11 September 2005 (next election by September 2009) election results: House of Councillors - percent of vote by party - NA; seats by party - DPJ 109, LDP 83, Komeito 20, JCP 7, SDP 5, others 18 House of Representatives - percent of vote by party (in single-seat constituencies) - LDP 47.8%, DPJ 36.4%, others 15.8%; seats by party - LDP 296, DPJ 113, Komeito 31, JCP 9, SDP 7, others 24 (2007)