The main purpose of this research is To find out what national interest of Japan was made in forest conservation in Indonesia in 2008 until 2015. One of the countries that have long committed to cooperate with the Indonesia is Japan, a country that once occupied Indonesia in the period 1942 - 1945. Through Japan ODA in Indonesia, Japan also contribute significantly to the field of human resource development and development of social infrastructure of Indonesia economy. Bilateral relations between Indonesia and Japan in the field of forestry have been conducted since the late 1960s, through the project "Mountain Logging Practice in Java". The research method used qualitative with descriptive analysis. This research use theory of National Interest, theory of foreign policy, and theory of International Cooperation which explains about the interest of Japan cooperation in Indonesia’s forestry sector. Therefore, there was interest in the cooperation with Indonesia Based on the evidence collected, the interest are Japan wants to protect their citizens from the threat of global warming and Japan wants to prosper their industry by trading Carbon.