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.*
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Prime Minister Takaichi Pledges to “Advance Deliberations Toward a Decision” on Constitutional Revision; Opposition Rallies and Demonstrations Also Held
May 2026
On Constitution Memorial Day, May 3, gatherings advocating constitutional revision, as well as rallies and demonstrations opposing constitutional amendment, were held across Japan. Prime Minister Sanae Takaichi (president of the Liberal Democratic Party) delivered a video message to a pro-revision gathering, stating that “deliberations in the Diet will be advanced toward making a decision,” thereby once again expressing her commitment to constitutional revision. However, she did not mention any specific provisions or timeline. [...]
Source: The Asahi Shimbun
On the 23rd and 24th, the Mainichi Shimbun conducted a public opinion survey that included questions related to constitutional revision: “Emergency Provisions at the Center of Constitutional Revision Debate: 38% Respond ‘Do Not Know,’ Indicating Limited Public Understanding” (see related article on the Mainichi Shimbun).
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