Constitution based on three principles

Japan's Constitution, which came into force in 1947, is based on three principles: sovereignty of the people, respect for fundamental human rights, and renunciation of war. The Constitution also stipulates the independence of the three branches of government - legislative (the Diet), executive (the cabinet), and judicial (the courts). The Diet, Japan's national parliament, is the highest organ of state power and the sole law-making organ of the state.
The Diet comprises the 480-seat House of Representatives (lower house) and the 242-seat House of Councillors (upper house). All Japanese citizens can vote in elections once they reach the age of 20.
Japan has a parliamentary system of government like Britain and Canada. Unlike the Americans or the French, the Japanese do not elect a president directly. Diet members elect a prime minister from among themselves. The prime minister forms and leads the cabinet of ministers of state. The cabinet, in the exercise of executive power, is responsible to the Diet.
Judicial power lies with the Supreme Court and lower courts, such as high courts, district courts, and summary courts. The Supreme Courts consist of a chief justice and 14 other justices, all of whom are appointed by the cabinet. Most cases are handled by district courts. There are also summary courts, which deal with problems like traffic violations.
There are 47 prefectural and over 3,300 municipal governments in Japan. Their responsibilities include providing education, welfare, and other services and building and maintaining infrastructure, including utilities. Their administrative activities bring them into close contact with local people. The heads of regional governments and local assembly members are chosen by local people through elections.
Under the Japanese Constitution, the Emperor is the symbol of the state and of the unity of the people. He has no power related to government. Emperor Akihito took the throne as the 125th Emperor of Japan in 1989.
Members of the Imperial Family receive state guests from other countries and make overseas visits. Through these and other activities, they fulfill an important role in promoting international friendship.
Members of the Imperial Family also maintain wide contact with Japanese citizens through their attendance at various events across the nation and visits to facilities for the handicapped and the aged. They widely respected by Japanese people.