Japan implements revised Imperial House Law to allow male adoptees

The revised Imperial House Law is set to take effect on October 24, 2026, introducing a system that allows male members of former imperial branches to be adopted into the Imperial Family. This change aims to ensure the stability of male-line succession by increasing the number of male imperial members.

Legal scholar Akira Momochi, a proponent of the revision, suggested that having at least four adoptees would provide greater security for the succession. However, the revision has faced criticism from scholars like Hideya Kasai, who note that it continues to exclude female and female-line emperors.

The law allows unmarried male descendants of former imperial branches, aged 15 or older, to be adopted. This measure addresses concerns regarding a potential shortage of male imperial members to support Prince Hisahito in the future. While some political figures have questioned the connection between the current Imperial Family and former branches, others emphasize their historical kinship. The Imperial Household Agency has stated it will prioritize privacy during the adoption process.