By Takuya Nishimura, Senior Fellow, Asia Policy Point
Former editorial writer for the Hokkaido Shimbun
You can find his blog, J Update here.
April 20, 2026
Both chambers of the Diet, including all the parties, resumed on April 16 their discussion of a stable process for succession to the imperial throne. The Speaker of House of Representatives, Eisuke Mori, hopes to wrap up the discussion and approve a revised Imperial House Law by the end of current session of the Diet, which is scheduled to close on July 15th. However, opinions of the parties are so different that they are unlikely to reach a consensus soon.
It was the first meeting with all the parties since April 2025 when two former prime ministers, Taro Aso with the Liberal Democratic Party (LDP) and Yoshihiko Noda with the Constitutional Democratic Party (CDPJ) of Japan, hit an impasse on the details of revision of the law. The structure of both chambers has changed significantly since then after the elections of the Upper House in 2025 and the Lower House in 2026.
It is recognized that keeping members of the Imperial Family would contribute stable succession to the throne. With a decrease in the number of male members in the Imperial Family who can succeed to the imperial throne, it is urgent that Japan find a way to put a workable succession process in place. The current Imperial House Law limits succession to male offspring in the male line. The Emperor Abdication Special Law, enacted in 2017, which allowed Emperor Akihito to abdicate, compels the Diet to reach a consensus on imperial succession as the will of the legislative branch.
A governmental conference of experts proposed to the Diet in 2021 two options for keeping members of the Imperial Family. They were 1) allowing female members to stay in the Imperial Family after marriage and 2) reinstating male members of the former Imperial Family along the male line through adoption. While the LDP, with its coalition partner the Japan Innovation Party (JIP), considers the latter the top priority, the CDPJ focuses on the former.
The CDPJ argues for the first option that the spouse and children of female members in the Imperial Family should also be given the status of members of the Imperial Family. The LDP is adamantly opposed, fearing that it would pave the way for an emperor in the female line. The CDPJ is skeptical about the second option because a former member of the Imperial Family may prefer not to be reinstated in the Imperial Family. These conceptual gaps have not narrowed in the discussions among the parties.
The Centrist Reform Alliance (CRA) in the Lower House, which resulted from the merger of the CDPJ and Komeito in January 2026, does not have internal agreement on this issue. Mori has asked the CRA to reach a consensus within a month and before the next meeting. The Democratic Party for the People, Komeito, and Sanseito all agree with both options.
The conservative parties, including the LDP, JIP and Sanseito, strongly advocate for exclusively patrilinear succession and oppose an emperor in the female line. Prime Minister Sanae Takaichi asserted in her speech to the LDP national convention on April 12th that the history of succession through the male line is the source of the throne’s authority and legitimacy.
It is a controversial argument. The Constitution of Japan does not include her conception of the emperor’s status. Article 1 states that the emperor’s position derives from “the will of the people with whom resides sovereign power.” The emperor’s “authority and legitimacy” thus stems from the people – who therefore may call for changes. Takaichi and the conservative powers’ insistence on succession along the male line may undermine the legal basis of the emperor as stated in the Constitution.
Currently, there are 16 members alive in the Imperial Family, all of whom are descendants of Emperor Yoshihito of Taisho. Five are males, and 11 females. The order of succession to Emperor Naruhito is topped by Crown Prince Akishino, Naruhito’s younger brother, followed by Akishino’s son Prince Hisahito, and Prince Hitachi, a younger brother of Emperor Emeritus Akihito. Under the patrilinear descent concept, Hisahito is the only possible successor in the next generation of Naruhito. Akihito is not included in the order of possible successors.
Female members of the Family include Princess Masako, her daughter Princess Aiko and Akihito’s wife Michiko. In the branches, the Akishino family has two females, Kiko and Kako, and other branches have six who have not married. A female member who marries a commoner must leave the Imperial Family.
In 1947, just before the Imperial Household Law took effect, there were 51 members of the Imperial Family. Eleven families left the Imperial Family later that year, partly because the General Headquarters of the Allied Forces shrank the budget for the privileges of the Imperial Family. The departing families were branches of male lines of former Emperors.
Those 11 former Imperial Families included the Fushimi, Kan-in, Yamashina, Kitashirakawa, Nashimoto, Kuni, Kaya, Higashifushimi, Asaka, Takeda, and Higashikuni branches. Now, only four of them, Kuni, Kaya, Takeda and Higasikuni, have male members in the male lines. Other families are expected to be eliminated as former Imperial Families, since they have no male successor.
Among the 11 families, the Takedas may be the best known. Tsunekazu Takeda is former president of Japan Olympic Committee. He is the third son of Tsuneyosi, a grandson of the Meiji Emperor. Tsunekazu, as the chairman of the bid committee, was involved in lobbying for the 2020 Tokyo Olympic Games (actually held in 2021), was targeted by French prosecutors in an Olympics corruption probe. Tsunekazu’s son, Tsuneyasu Takeda, is well known as an ultra-conservative TV commentator. Tsunekazu and Tsuneyasu, however, have never been members of the Imperial Family because they were born after the Takeda family had left the royal household.
The second option in the 2021 experts’ report proposed that patrilinear members of the imperial family could adopt male members of the eleven families who had left in 1947. However, the CRA and the CDPJ argue that such adoptions may violate Article 14 of the Constitution of Japan. Article 14 prohibits discrimination based on family origin. Forcing a man in one of the 11 families into the Imperial Family but who does not want to go may constitute discrimination. Debate over the stability of the Imperial Family is hard to keep politically neutral.






