The Constitutional Revision Research Project seeks to follow, analyze, and document constitutional discussion in Japan.
Mainichi ShimbunThe Constitution of Japan (also known as the Postwar Constitution) went into effect in 1947, replacing the Meiji Constitution of 1890. It is recognized as the oldest unamended constitution in the world as of 2022, having never undergone revision in over 70 years since its promulgation. Throughout this time, constitutional revision has become an important subject of vigorous debate and discussion in Japan and around the world.*
Explore The Constitution of JapanFeatured News
Japan Lower House Passes Referendum Reform Bill
June 19, 2026
Japan's House of Representatives, the lower chamber of the Diet, the country's parliament, passed a bill to revise the law on national referendums on constitutional amendments by a majority vote at a plenary session on Friday.
The bill was approved with support from the Liberal Democratic Party-led ruling camp and some opposition parties, including the Centrist Reform Alliance and the Democratic Party for the People. [...]
Source: Jiji Press
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