Three Parties Hit a Deal on Reduction of Diet Seats
The Liberal Democratic Party (LDP), Japan Innovation Party (JIP) and the Democratic Party for the People (DPP) agreedon October 28th to reduce 31 seats in proportional district of the Lower House. While the LDP and JIP have been asserting that 45 seats, worth 10 percent of all the seats in the Lower House, the DPP opposed the idea. As the leading coalition made a compromise to accept DPP’s proposals, those three parties reached a deal. The leading coalition secured a simple majority in both chambers of the Diet.
Upholding an agreement for coalition partnership in October 2025, the LDP and JIP sponsored a bill to reduce 45 seats of reduction. The bill faced protest from opposition parties, including the DPP, because reduction in proportional representatives had greater impact on small parties than major ones. As other opposition parties fundamentally doubted necessity of reducing Diet seats, the DPP proposed an alternative option that would reduce 19 seats in the proportional district.
Finding a hope to cooperate with the DPP, the LDP revised its original plan and proposed 31 seats of reduction. The reason of changing from 45 seats to 31 was to adjust the number based on decline of population. The DPP has been arguing that the seat reduction should be made according to decline of population in Japan. “Solution rather than confrontation” is the main slogan of the DPP. It is likely that the DPP seeks a possibility of forming a coalition with the LDP.
To secure DPP’s approval, the LDP accepted some other opinions on reform of election system. The DPP demanded integration of two blocks, Chugoku and Shikoku, among eleven blocks for proportional district. It has been getting hard for small parties to get seats in Chugoku and Shikoku, because of decline of population. The integration gives them more chances to have a seat. The leader of DPP, Yuichiro Tamaki, is elected from a single-seat district in Shikoku and have certain influence in the elections there. The LDP accepted the DPP’s idea.
The LDP also agreed on introducing integrated slate by multiple parties. The calculation of winners in proportional representatives will be changed from D’Hondt method to Sainte-Lague method which is advantageous for small parties. Those are also to give more chance to small parties. Instead, the three parties shared an idea of changing threshold for a candidate who lost in single-seat district to resurrect in proportional district from achieving one-tenth of all the viable votes to one-sixth.
Knowing that the issue is for the LDP to maintain coalition with the JIP that sticks to reduction of Diet seat as its own agenda for political reform, the other opposition parties firmly oppose it. As the Diet has unwritten rule that the reform of election system needs comprehensive consent of the parties, it is expected that further discussion will be made in current session of the Diet.
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