The Constitution of the Empire of Japan (Kyūjitai: 大日本帝國憲法; Shinjitai: 大日本帝国憲法, ), known informally as the Meiji Constitution (明治憲法, Meiji Kenpō), was the constitution of the Empire of Japan which was proclaimed on February 11, 1889, and remained in force between November 29, 1890 and 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 German and British models. In theory, the Emperor of Japan was the supreme leader, 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 parliament.
During the American Occupation of Japan the Meiji Constitution was replaced with the "Postwar Constitution" on November 3, 1946; the latter document has been in force since May 3, 1947. In order to maintain legal continuity, the Postwar Constitution was enacted as an amendment to the Meiji Constitution.
The Meiji Restoration in 1868 provided Japan a form of constitutional monarchy based on the Prusso-German model, in which the Emperor of Japan was an active ruler and wielded considerable political power over foreign policy and diplomacy which was shared with an elected Imperial Diet. The Diet primarily dictated domestic policy matters.
After the Meiji Restoration, which restored direct political power to the emperor for the first time in over a millennium, Japan underwent a period of sweeping political and social reform and westernization aimed at strengthening Japan to the level of the nations of the Western world. The immediate consequence of the Constitution was the opening of the first Parliamentary government in Asia.
The Meiji Constitution established clear limits on the power of the executive branch and the Emperor. It also created an independent judiciary.