How did the 1947 constitution change the role of the Japanese emperor?

The 1947 constitution fundamentally transformed the role of the Japanese emperor from a figure of supreme authority to a purely symbolic one. Under the prewar Meiji Constitution, the emperor was considered "sacred and inviolable" and held sovereign power. In contrast, the 1947 constitution shifted sovereignty to the people, defining the emperor solely as the "symbol of the State and of the unity of the People".123

Key changes included:

• Loss of Political Power: The emperor no longer possesses independent powers of government. Authority now resides with the elected Diet, which selects the executive branch.241
• Ceremonial Duties: The emperor’s responsibilities are limited to ceremonial and constitutional functions, such as appointing the prime minister and chief judge as designated by other bodies, awarding honors, and receiving foreign ambassadors.24
• Renunciation of Divinity: The emperor formally renounced his traditional quasi-divine status on January 1, 1946, prior to the constitution taking effect in 1947.13

These reforms established Japan as a constitutional monarchy, ensuring the imperial institution remained a unifying symbol while removing its capacity to influence state policy.13