Japan's Lower House Votes to Let Princesses Keep Their Titles — but Not Pass Them On

Japan's lower house of parliament cleared a set of landmark bills on Friday aimed at shoring up a rapidly shrinking imperial family, including a provision that would for the first time allow princesses to keep their royal status after marrying commoners. It is the most significant revision to the Imperial House Law since it was enacted in 1947.

Under the current law, a Japanese princess loses her royal standing the moment she marries outside the imperial house, a rule that has steadily drained the family of members as its women marry and depart. The reform now advancing through the Diet would let those women remain royals, helping to sustain an institution that has dwindled to a handful of aging members and only one young male heir in the direct line.

But the changes come with a pointed limit. Under the compromise language, a princess who marries a commoner would keep her title, yet her spouse and any children would remain outside the imperial family and excluded from the line of succession. In practical terms, Princess Aiko — the only child of Emperor Naruhito and Empress Masako — could marry and stay a princess, but her children would be commoners, because succession will continue to pass only through male lines.

The bills also revive a second mechanism to bolster the family's ranks: allowing male descendants of former imperial branches, which were stripped of their royal status after World War II, to rejoin the household through adoption. Supporters of male-only succession favor that route as a way to replenish potential heirs without opening the throne to women, a step Japan's conservative establishment has resisted for decades despite broad public sympathy for a reigning empress.

Major parties across the political spectrum backed the draft proposal, reflecting an unusual consensus that something had to be done to prevent the monarchy from withering. The legislation now heads to the upper house, where it is expected to pass before the current parliamentary session ends on July 17.

Critics argue the measures dodge the central question. By preserving male-only succession while merely slowing the family's decline, lawmakers have punted on whether Japan is prepared to see a woman or a matrilineal descendant ascend the Chrysanthemum Throne — a debate that polls show most of the public has already resolved in favor of change. For now, the reform buys the world's oldest continuous hereditary monarchy time, without settling the argument over who may one day sit at its center.