Skripsi ini membahas kepentingan ekonomi Jepang yang diidentifikasi dari partisipasi penguatan skema kerjasama keuangan Asia Timur, Chiang Mai Initiative 2000-2009. Dengan pendekatan kualitatif, penelitian ini menekankan pada metode analisis konten. Kerangka pemikiran penelitian ini berangkat dengan konsepsi interdependensi, institusionalisme, dan teori perumusan kebijakan luar negeri, dengan mengombinasikan pendekatan moneter. Hasil penelitian menunjukkan bahwa Jepang memiliki kepentingan nasional yang harus diwujudkan dalam bentuk penguatan kerjasama keuangan di Asia Timur, Chiang Mai Initiative. Menurunnya performa ekonomi nasional Jepang, terutama terkait dengan liberalisasi kapital Jepang di seluruh dunia, menuntut perlunya penguatan stabilitas moneter di internal kawasan untuk mengamankan kerentanan ekonomi domestik Jepang.

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This research focuses on the Japan's economic interest which is indicated by her further participation in East Asian financial cooperation scheme under Chiang Mai Initiative, 2000-2009. Under qualitative approach, this research mostly uses content analysis method. The framework of thingking begins with the concept of interdependence, institutionalism, and theory of foreign policy making, then combined with monetarism approach. The result of this research shows that Japan has a national interest that must be articulated through strengthening efforts of East Asian financial cooperation, Chiang Mai Initiative. The slowdown of Japan economic performance through time, i.e. related to its capital liberalization throughout the globe, as proven by this research, urge Japan to empower monetary stability within East Asia in order to secure its economic fragility.