Japan passes imperial succession reform, keeps ban on female emperors as public support for an empress reaches 70%

Parliament passes revision keeping male-only succession

Japan's parliament, the Diet, enacted a revision of the Imperial House Law on Friday 17 July 2026, updating the 1947 statute for the first time while firmly rejecting the possibility of a female emperor. The legislation introduces two main measures: it opens the door for male descendants from 11 former collateral branches of the imperial family, cut off after the Second World War, to be adopted into the family and father future heirs, and it allows princesses to retain their royal status even after marrying a commoner. However, the ban on women ascending the Chrysanthemum Throne remains, despite poll after poll showing that roughly 70% of the Japanese public would welcome a female sovereign.

It's a declaration to prevent female monarchs... and to defend the male-lineage at all costs. They cannot say it's male chauvinism, so they call it tradition.

An imperial family running out of heirs

Behind the reform lies a pressing demographic problem. Only three males currently stand in the line of succession: the emperor's younger brother Crown Prince Fumihito, his son 19-year-old Prince Hisahito, and the emperor's 90-year-old uncle. Of the 16 adult members of the imperial household, just five are men. Prince Hisahito, born in 2006, is the first male royal baby in four decades; before him, the previous generation had produced nine girls. Without changes, the hereditary institution faces what Prime Minister Sanae Takaichi's government calls a risk to dynastic stability.

What the new law does and does not do

Under the amended rules, male descendants from the 11 princely cadet branches that were pruned from the imperial lineage in 1947 may now be re-adopted. Adoptees must be at least 15 years old, unmarried and childless. They themselves will not be eligible for the throne, but their male offspring can enter the line of succession. Meanwhile, princesses who marry a commoner will no longer be forced to leave the imperial family, a reversal of a rule that previously saw daughters of emperors, including former princess Sayako, lose their royal titles upon marriage. Critics note, however, that the revision does nothing to address the central issue of gender discrimination: Princess Aiko, the 24-year-old daughter of Emperor Naruhito and a hugely popular figure, remains excluded from the succession solely because she is a woman.

Public support for an empress meets conservative resistance

Recent surveys repeatedly indicate that about 70% of Japanese citizens favour allowing a woman to occupy the throne, yet the government of Prime Minister Sanae Takaichi, the country's first female head of government, has championed the male-only principle. Takaichi and other conservative lawmakers have described the paternal bloodline as "the only source of the emperor's authority and legitimacy." In October 2024 the UN Committee on the Elimination of Discrimination Against Women had urged Japan to amend its imperial law to align with gender equality, a recommendation that the new legislation partly acknowledges (by letting princesses keep their status after marriage) but without granting them succession rights.

A long tradition of male-only succession

The imperial institution itself is considered the world's oldest continuous hereditary monarchy, with a tradition dating back to 660 BCE. The male-only succession rule, however, was not formally enacted until the 1890 Imperial House Law, which first codified patrilineal succession during Japan's patriarchal Meiji era. The post-war 1947 version carried that rule forward, and Friday's revision, despite some modernising gestures, reaffirms it. Eight women have reigned in the past, the last being Empress Gosakuramachi from 1762 to 1770.

It's very ironic that the first female prime minister herself is the leading proponent of the obsession with male-succession.

The legislation had already been passed by the lower house and was expected to clear the upper chamber later on Friday, completing a process that conservatives had delayed for years and that, according to historian Hideya Kawanishi of Nagoya University, constitutes an explicit effort "to prevent female monarchs."