The Constitution of Japan (Shinjitai: 日本国憲法 Kyūjitai: 日本國憲法 Nihon-Koku Kenpō?) is the fundamental law of Japan. It was enacted on May 3, 1947, as a new constitution for a post-war Japan.
The constitution provides for a parliamentary system of government and guarantees certain fundamental rights. Under its terms the Emperor of Japan is "the symbol of the State and of the unity of the people" and exercises a purely ceremonial role without the possession of sovereignty.
The constitution, also known as the "Post-war Constitution" (戦後憲法 Sengo-Kenpō?) or the "Peace Constitution" (平和憲法 Heiwa-Kenpō?), is best known for its Article 9, by which Japan renounces its right to wage war; and to a lesser extent, the provision for de jure popular sovereignty in conjunction with the monarchy.