Japan's parliament approved a significant bill on Friday to revise the country's Imperial House Law, which outlines the rules for succession to the imperial throne. The legislative update introduces new provisions allowing the imperial family to adopt male relatives from distant branches of the family who are over the age of 15. Furthermore, these adopted individuals' future sons will be granted eligibility to ascend the throne, and princesses will now be permitted to retain their royal status even after marrying individuals outside of the imperial family.
Despite these changes, the long-standing ban on female emperors remains in force. This decision persists notwithstanding the popularity of Princess Aiko, the 24-year-old daughter of Emperor Naruhito, and growing concerns regarding the narrowing imperial lineage. Under the current structure, the succession is set to pass to the Emperor's 60-year-old younger brother, Crown Prince Fumihito, followed by his 19-year-old nephew, Prince Hisahito. Without further legal amendments, the existing bloodline faces the risk of ending if Prince Hisahito does not produce a son.
The male-only succession mandate traces its origins to the 1889 Imperial House Law, which stipulated that only men descended through the paternal line could become emperor. This principle was subsequently incorporated into the 1947 law, and the current amendment marks the first time the primary text has been modified since 1949. Public sentiment appears to contrast with the government's stance; a nationwide poll by the Mainichi Shimbun in late March indicated that 61% of respondents supported female succession, while a follow-up survey of over 2,000 participants from June 20 to 21 showed 73% in favor.
Political opposition remains, notably from conservative figures such as the nation's first female prime minister, Sanae Takaichi. Hideya Kawanishi, an expert on the imperial system at Nagoya University, criticized the new legislation, stating that it fails to reflect public opinion. Kawanishi argued that the move was likely driven by the need to secure votes from a conservative base that holds views described as male chauvinistic.
