The intent of this study is to assess the role of fundamental Japanese security policy objectives in driving the significant shifts in Japan???s approach towards missile defence cooperation with the United States from 1993 to 2003. In studying the relative influence of the objectives that guided Japan???s approach towards missile defence cooperation, this thesis seeks to address a gap in the literature. A debate has occurred over the direction of Japanese security policy that is based on widely different assumptions on the importance attached to various fundamental security objectives. At the same time, Japan???s approach to missile defence has been the subject of considerable analysis that identified the crucial importance of the issue for the attainment of these fundamental security policy objectives. But no linkage has been established between these two levels of analysis. In particular, there has been an absence of assessments of what Japan???s decisions on missile defence cooperation indicate about the relative influence of the various objectives. This thesis developed an analytical framework to enable such an assessment by examining the structure of missile defence cooperation undertaken. Japan possessed a range of options in the level and type of involvement in missile defence cooperation. That involvement would determine the eventual type of benefits and costs incurred against the affected objectives. Cooperation agreed to (or rejected) over the ten year period thereby provides a means to determine the influence of key objectives on Japan???s approach, and in particular those objectives that restrained involvement. The thesis finds that a clear hierarchy existed in the influence of the various objectives on Japan???s approach with changes in their influence explaining the evolution of Japan???s commitment. The desire to strengthen the alliance, weakening domestic political constraints, and disregard of China???s opposition provide the key explanations. These findings not only point towards the respective strengths and weaknesses of the various approaches employed to explain Japanese security policy, but they also suggest the value of greater attention to the state???s ability to overcome domestic constraints in determining policy in order to fully understand the broader transformation of Japanese security policy.

由美國911事件作為分水嶺，重新界定了日本對於現代情報戰爭的認知，當今21世紀的國際社會儼然成為情報戰場，換言之，情報研究科學早已隨社會需要，發展成跨越學科範疇之複合性知識。日本二戰後在國際上先以強大的情報力穩扎經濟領域，然其后陷入失落的二十年，國際影響力亦隨之萎靡，致使日本政府遂行原有情報組織體制之調整，及相關情報政策實務之運行，皆成為安倍政權引領日本必經的荊棘之道。 本文研究重點界分四面向：其一、戰後日本國家安全機制的發展與轉變，記錄其所歷經重大事態時之因應模式，介紹其安保政策結構化之過程；其二、從內外環境分析日本成立國家安全會議之意涵，先交代「南北韓仇日遺緒」、「中國崛起論」等當今亞太局勢，分析日本國家安全保障會議何以在歷史遺題中為安保政策解套；其三、解構日本國家安全保障會議制度，分析日本政治結構與社會，研究日本國家安全保障會議在創立後，其行政職權上如何調整日本情報組織之運作；其四、以特定秘密保護法分析日本國家安全保障會議之角色，闡述安倍政權必然以情報需求達到社會控制之強化，進而實踐其安保戰略。 日本情報組織隨國際環境變化而沿革，歷經1990至2000年的轉型期後，其於2000年迄今已表現出擴張之型態。在安倍內閣的戰略藍圖中是要以首相官邸為核心，使其成為統籌國家安全保障政策之司令塔，而日本國家安全保障會議與國家安全保障局之設立，即是其鞏固中央集權，並使首相意志能主導日本復興的戰略。 / The September 11 terrorist attacks marked a watershed moment for the recognition and dispose of intelligence, in other words, the research of intelligence has become an interdisciplinary knowledge. After the Second World War, Japan has consolidated its economic power by sound espionage system. But Japan has later on lost its international impact after gone through 20-Year-Recession. This made an intractable way for Shinzo Abe to readjust and innovate the espionage system. The thesis includes four dimensions: First, focusing on the transformation of national security mechanism in Japan after the Second World War, and the structuralization of Security Policy. Second, analyzing the implication of the found of Japan’s National Security Council(NSC) from domestic and international factors. Third, destructuring the NSC , try to analyze the social and political structure in Japan. Forth, analyzing the role of NSC from the perspective of Secret Protection Law, which for Abe is a way to further control the society and carry out the security strategy. The intelligence organization in Japan proceeds as the international situation changed. Till now it has strengthened its power and influence after going through a period of transforming from 1990 to 2000. Among Abe’s strategic viewpoints, making Prime Minister’s Office as a core to unify national security is the top priority. The found of NSC and National Security Agency(NSA) is also a way for Abe to centralize the authority and to carry out his will, which can eventually lead to the revival of Japan.