民主黨於 2009 年的眾議院選舉中大勝，取代自民黨執政，然而也在 3 年後的選舉中大敗而結束政權。「民主黨政權為何失敗?」成為研究現代日本政治變動的新題材。既有的研究主要從政治主導的失敗、首相領導權的不足，以及政權公約的挫折來分析，本文則從「分立國會」的新觀點來分析，論述在「分立國會」架構下，參議院如何透過「特例公債法案」的審查，來影響民主黨政權的重要政策與政權運作。 本文研究結果發現，以往被視為眾議院輔助角色的參議院，其影響力已經不..

The Democratic Party of Japan(DPJ)won a landslide victory in the election of House of Representatives in 2009, replacing the Liberal Democratic Party(LDP)as the ruling party, but abruptly terminated due to an overwhelming defeat in another election three years later. Why did the DPJ fail? This question has become a striking issue of modern political science in Japan. Existing studies mainly focus on perspectives such as defeat of political dominance, inadequacy of prime minister’s leadership, or failure of Manifesto. Th..

日本民主黨於 2009 年的眾議院選舉中擊敗執政的自由民主黨，黨魁鳩山由紀夫於 9 月 16 日成為日本首相。由於民主黨在參議院未過半，為了維持國會穩定運作，鳩山首相選擇與社會民主黨、國民新黨組成聯合內閣。 不過鳩山政權內部不斷出現閣員之間的對立，而鳩山首相始終無法處理這些政府決策過程之中所發生的混亂，學者與主要媒體多認為，發生混亂的原因是在於鳩山本人的領導能力不足。不過本論文認為，導致鳩山政權內部的混亂主因是民主黨建構的決策運作模式本..

Yukio Hatoyama, the chairman of the Democratic Party of Japan (DPJ), succeeded to the Prime Minister of Japan on 16 September 2009 after DPJ won the 2009 Japanese general election. In the election, DPJ acquired 308 out of a total of 480 seats in the House of Representatives of Japan, while the Liberal Democratic Party(LDP), the former ruling party only acquired 119 seats. However, Hatoyama was thus forced to form a coalition government with the Social Democratic Party and the People’s New Party in response to a situatio..