Japan is a constitutional monarchy where the power of the Emperor is very limited. As a ceremonial figurehead, he is defined by the constitution as "the symbol of the state and of the unity of the people". Power is held chiefly by the Prime Minister of Japan and other elected members of the Diet, while sovereignty is vested in the Japanese people. The Emperor effectively acts as the head of state on diplomatic occasions. Akihito is the current Emperor of Japan. Naruhito, Crown Prince of Japan, stands as next in line to the throne.

Japan's legislative organ is the National Diet, a bicameral parliament. The Diet consists of a House of Representatives, containing 480 seats, elected by popular vote every four years or when dissolved and a House of Councillors of 242 seats, whose popularly elected members serve six-year terms. There is universal suffrage for adults over 20 years of age,[9] with a secret ballot for all elective offices. In 2009, the social liberal Democratic Party of Japan took power after 54 years of the liberal conservative Liberal Democratic Party's rule.

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