Japan revises Imperial House Law to sustain monarchy amid declining numbers

Japan's Parliament has enacted revisions to the Imperial House Law, enacted on July 17, aiming to secure the future of the world's oldest hereditary monarchy. The changes address the dwindling number of imperial family members, which currently stands at 16: five men and eleven women.

The revised law introduces two key provisions. Firstly, it allows for the adoption of males aged 15 or older who descend from the male line of 11 former branch families. These families were stripped of their imperial status in 1947 following World War II. While these adopted males cannot become emperor, their male-line descendants would be eligible to ascend the Chrysanthemum Throne. Secondly, female members of the imperial family will now retain their status upon marrying commoners, though their spouses and children will not be granted imperial status. These women will receive the same annual allowance as male members, set at 30.5 million yen (approximately $242,000) for fiscal year 2026.

Despite public support for female emperors, the revision does not alter the succession rules, which exclusively allow males descending from an emperor through the male line to inherit the throne. This upholds a tradition favored by many conservatives, including members of Prime Minister Sanae Takaichi's Liberal Democratic Party. Japan has a history of female emperors, with eight women having reigned across ten reigns, including Empress Suiko and Empress Jito, all of whom belonged to the male imperial line.

Momentum for revising the law gained traction in 2017, coinciding with the first imperial abdication in two centuries. A government panel later proposed measures to maintain a sufficient number of imperial family members. Cross-party discussions, initiated in January 2022, faced obstacles due to disagreements over the adoption of males from former branch families. A breakthrough occurred in February, paving the way for the current legislative changes.