World

Japan's Parliament Revises Imperial Law, Maintains Male-Only Succession

Herz — World Desk · 17 July 2026 at 05:35 · 30s summary · 3 min read

The essentials

Japan's Parliament adopted a revision to the Imperial House Law (Kōshitsu Tenpan) on July 17, 2026, marking the first significant modification since its enactment in 1947. The reform maintains male-only succession while expanding the imperial family circle. It enables the reintegration of collateral branches excluded after World War II and ensures princesses retain imperial status if they marry civilians. Japan currently has only three eligible heirs to the throne.

First significant revision to Japan's 1947 Imperial House Law: succession remains male-only.
Eleven collateral imperial branches excluded after World War II may be reintegrated.
Princesses will retain imperial rank even after marrying civilians.
Only three male heirs currently eligible for the Chrysanthemum Throne.
About 70% of Japanese support female succession, according to recent polls.

Japon : le Parlement révise la loi impériale et maintient la succession masculine — Dumas Roger, CC BY-SA 4.0, Wikimedia Commons

What we know

Japan's Parliament approved a revision to the Imperial House Law (皇室典範, Kōshitsu Tenpan) on July 17, 2026. In force since 1947, this law governs succession to the throne, members of the imperial family, and other matters related to imperial administration. According to ANSA news agency, this represents the first significant modification of the legislation.

The revision maintains male-only succession while opening two new pathways to expand the imperial family circle.

The two new measures

First, male descendants in the paternal line from eleven imperial family branches excluded during post-war reforms may be reintegrated. They must be at least 15 years old, unmarried, and childless.

These individuals cannot directly accede to the throne. However, their future male descendants will be eligible to appear in the line of succession.

Second, princesses will retain their imperial rank if they marry civilians. Previously, such marriage automatically removed them from the imperial family.

An Imperial Family on the brink

Japan currently has only three male heirs eligible to the throne, including Crown Prince Akishino and his son Prince Hisahito.

eligible heirs to the Chrysanthemum Throne

collateral branches eligible for reintegration

~70%

Japanese supporting female succession (recent polls)

The Chrysanthemum Throne—in Japanese, kōi (皇位)—is the common name for the Japanese imperial throne. Its emblem, the sixteen-petaled chrysanthemum, has been associated with emperors since the Kamakura period. This dynastic seat is considered the world's oldest continuous hereditary monarchy, with a tradition tracing back to 660 BCE.

Conservative pressure and public opinion

Conservative and nationalist circles close to Prime Minister Sanae Takaichi's government pressured lawmakers to maintain the tradition of male succession. These efforts effectively prevented any opening to female succession.

This stance contrasts sharply with public sentiment: approximately 70% of Japanese support allowing a woman to ascend the throne, according to recent polling.