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
Penlights Sway in Front of the National Diet at Night as Citizens Call for Peace: “Prime Minister, Uphold the Constitution”
March 25, 2026
“On the evening of the 25th, a demonstration opposing the revision of Article 9 of the Constitution, titled ‘Emergency Action to Protect the Peace Constitution,’ was held outside the National Diet Building. Participants, holding placards and penlights, chanted slogans such as ‘Prime Minister Takaichi, uphold the Constitution,’ ‘Neither the Liberal Democratic Party nor Ishin should amend the Constitution,’ and ‘No to war—protect Article 9.’” [...]
Source: Asahi Shimbun.
Photo: Asahi Shimbun
Featured Chapter
Photo: Mainichi Shimbun
Featured Voice
Photo: Wikipedia
Featured Draft
Photo: Mainichi Shimbun