On Friday, July 17th, 2026, Japan's parliament approved a bill revising the Imperial House Law, which governs the line of succession to the Japanese imperial throne. The revisions permit the imperial family to adopt male distant relatives over the age of 15, making their future sons eligible for the throne. Additionally, princesses will now be able to retain their royal status after marrying commoners.

However, the longstanding ban on female emperors remains unchanged. This decision persists despite widespread public support for a female monarch, as revealed by a nationwide opinion poll conducted by the Japanese newspaper Mainichi Shimbun in late March, which found that 61% of respondents favored the idea of a female emperor, while only 9% opposed it.

The current male-only succession law, dating back to the 1889 Imperial House Law, restricts the throne to men descended through the paternal line. Under these rules, the imperial line will pass from Emperor Naruhito to his younger brother, 60-year-old Crown Prince Akishino (also known as Crown Prince Fumihito), and then to Akishino's 19-year-old son, Prince Hisahito. Without further legal changes, the imperial lineage could end if Prince Hisahito does not have a son.

Experts and royal watchers have expressed concern that the male-only succession and the loss of princesses upon marriage threaten the stability of the 1,500-year-old hereditary institution. Former Imperial Household Agency chief Shingo Haketa described the monarchy's future after Prince Hisahito as "extremely unstable."

Hideya Kawanishi, a Nagoya University monarchy expert, criticized the ruling Liberal Democratic Party's conservative faction for prioritizing the preservation of male-line succession over public opinion. He stated, "For the conservative camp of the ruling Liberal Democratic Party and the likes, the overriding goal is to preserve the male-line, male-only succession to the throne, and that is precisely why they do not want to listen to the voices of the people." Kawanishi added that this stance likely reflects the party's need to secure votes from a conservative base with attitudes "akin to male chauvinism."

Emperor Naruhito's daughter, Princess Aiko, aged 24, remains popular among the public as a potential successor but is ineligible under current law due to her gender. The emperor himself has avoided directly addressing proposals for female succession but has acknowledged the important role of female royals in the monarchy.

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