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 Ruling Camp Loses Upper House Majority, PM Vows to Stay On
Tokyo, July 21, 2025
“TOKYO - Japan's ruling coalition lost its majority in the House of Councillors in Sunday's election, an outcome that will add pressure on embattled Prime Minister Shigeru Ishiba, who vowed to stay on despite yet another heavy blow to his party.”...
* An emerging political party, Sanseito, which released a constitutional draft in May 2025, increased its seats in the House of Councillors from one to fifteen (see related reporting by the Yomiuri Shimbun).
[Copyright KYODO NEWS.]
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