Japan has changed the rules governing its monarchy for the first time in a meaningful way since the postwar era, seeking to head off a looming shortage of heirs while preserving the centuries-old principle that only men may sit on the Chrysanthemum Throne.
Parliament approved the revision of the 1947 Imperial House Law, as reported by France 24 and other outlets, introducing two significant changes. The first would let the imperial family adopt male heirs, aged around 15 or older, from formerly royal branch families that were stripped of their status after the Second World War but which descend from past emperors through the male line. The second would allow female members of the family to keep their imperial status and duties even after they marry a commoner, rather than leaving royal life as they must now.
The problem the law is meant to solve
The urgency stems from simple arithmetic. The imperial family has dwindled, and there are very few young men in line to inherit. Emperor Naruhito has only a daughter, Princess Aiko, who cannot succeed him under the current rules. The succession therefore runs to his younger brother, Crown Prince Akishino, and then to Akishino's teenage son, Prince Hisahito, who is second in line and effectively the only young male heir. Beyond him, the line all but runs out.
By opening a path to adopt men from old male-line families, and by keeping married princesses within the fold, the government hopes to widen a perilously narrow pool of potential heirs and steady the institution for another generation or two.
What it does not do
What the revision pointedly does not do is allow a woman to become empress, or to pass the throne to her children. Male-only, patrilineal succession remains intact. Prime Minister Sanae Takaichi has defended that principle, saying it is appropriate to keep eligibility limited to male descendants of the imperial line.
That position sits awkwardly with public opinion. Surveys have repeatedly shown strong majorities in favour of allowing a female emperor, and of permitting succession through the female line, with support running as high as nine in ten in some polls. Opposition politicians and campaigners criticised the government for sidestepping that question and for limiting debate, arguing that the reforms address the symptom, a lack of heirs, while avoiding the underlying issue.
An old rule, a modern debate
The bar on female emperors is often assumed to be ancient, but Japan has in fact had reigning empresses in its distant past; the strict male-only rule was codified in the modern era. Supporters of change argue that returning to allow women, or opening the throne to the female line, would both reflect contemporary values and solve the heir shortage at a stroke. Traditionalists counter that unbroken male-line succession is the essence of the institution and must not be altered.
For now, the government has chosen the narrower path. The adoption measures may buy time, but they leave the deeper questions unresolved. As Prince Hisahito grows up and, in due course, starts a family of his own, Japan seems likely to return to the argument it has just declined to settle: whether a monarchy struggling to produce male heirs can go on excluding the women who might otherwise secure its future.
