chief of state: Emperor AKIHITO (since 7 January 1989)
head of government: Prime Minister Naoto KAN (since 8 June 2010)
cabinet: Cabinet is appointed by the prime minister (For more information visit the World Leaders website ) elections: Diet designates the prime minister; constitution requires that the prime minister commands parliamentary majority; following legislative elections, the leader of majority party or leader of majority coalition in House of Representatives usually becomes prime minister; the monarchy is hereditary
Legislative branch:
bicameral Diet or Kokkai consists of the House of Councillors or Sangi-in (242 seats - members elected for fixed 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 maximum four-year terms; 300 in single-seat constituencies; 180 members by proportional representation in 11 regional blocs); the prime minister has the right to dissolve the House of Representatives at any time with the concurrence of the cabinet
elections: House of Councillors - last held on 11 July 2010 (next to be held in July 2013); House of Representatives - last held on 30 August 2009 (next to be held by August 2013)
election results: House of Councillors - percent of vote by party - DPJ 31.6%, LDP 24.1%, YP 13.6%, NK 13.1%, JCP 6.1%, SDP 3.8%, others 7.7%; seats by party - DPJ 106, LDP 84, NK 19, YP 11, JCP 6, SDP 4, others 12
House of Representatives - percent of vote by party (by proportional representation) - DPJ 42.4%, LDP 26.7%, NK 11.5%, JCP 7.0%, SDP 4.3%, others 8.1%; seats by party - DPJ 308, LDP 119, NK 21, JCP 9, SDP 7, others 16 (2009)
Judicial branch:
Supreme Court (chief justice is appointed by the monarch after designation by the cabinet; all other justices are appointed by the cabinet)