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..

在戰後日本民主憲政史上，2005 年舉辦的第 44 屆日本眾院議員選舉深受各界重視，特別是因為該屆選舉，是日本政治史上首度因重大政策遭國會否決，內閣首相逕予交付民意定奪的一項公民複決選舉。當時自民黨的執政內閣能否在改選中贏取民心，亦或由民主黨等在野黨派來更迭政權，不僅攸關小泉純一郎首相政治生命與改革路線的延續，更牽動日本未來政經局勢的發展走向，其重要性確實不容小覷。 有別於過往研究囿限於宏觀層次或質化的研究途徑，本文嘗試根據日本選舉研究..

The 44th Japanese House election in 2005 has played a significant role in its post-war democratic history and also drove a lot of attention in the academics. The importance of this election, regarded as the national referendum for the postal reform, relies on the fact that it is the first time the House is dismissed because of unsolved policy gridlock. The consequence of the election not only results in the destine of LDP coalition government and the political career of Prime Minister Junichiro Koizumi, but also the developme..