The Constitution of the Empire of Japan (Kyūjitai: 大日本帝國憲法 Shinjitai: 大日本帝国憲法 Dai-Nippon Teikoku Kenpō?), known informally as the Meiji Constitution (明治憲法 Meiji Kenpō?) was the constitution of the Empire of Japan which had the proclamation on February 11, 1889, and had enacted since November 29, 1890 until May 2, 1947. Enacted after the Meiji Restoration in 1868, it provided for a form of mixed constitutional and absolute monarchy, based jointly on the Prussian and British models. In theory, the Emperor of Japan was the supreme ruler, and the Cabinet, whose Prime Minister would be elected by a Privy Council, were his followers; in practice, the Emperor was head of state but the Prime Minister was the actual head of government. Under the Meiji Constitution, the Prime Minister and his Cabinet were not necessarily chosen from the elected members of the Diet.
Through the regular procedure for amendment of the Meiji Constitution, it was entirely revised to become the "Postwar Constitution" on November 3, 1946, which has been in force since May 3, 1947.