- 2019 - 2024 Multi-Archival Analysis of Critical Junctures in Post-war Northeast Asia
- 2021 - 2024 China's Regionalist Diplomacy in East Asia and Its Impact on the Korean Peninsula
- 2018 - 2021 Globalizing East Asian Historical Perception Problems
- 2018 - 2021 日米韓の安全保障関係の形成と展開に関する歴史的および政策的研究
- 2015 - 2018 Historical and Policy-oriented Study on the Regionalist Diplomacy of the Republic of Korea
- 2014 - 2017 The Rise of China and India and its Impacts on Neighboring Asia: Dialectical Dynamics of Domestic Politics and International Relations
- 2015 - 2017 戦後韓国の地域主義外交に関する歴史・政策研究
- 2011 - 2014 Building Civil Society in Asia and its Challenge for International Society
- 2008 - 2013 Comparative Studies on European and Asian Regional Integration considering International Politics--Norms, Security, Borders and Immigration
- 2011 - 2013 Building Civil Society in Asia and its Challenge for International Society
- 2010 - 2013 Transformation of the post-war East Asian Regional Order centering upon Korean peninsula
- 2006 - 2009 Joint Research with multi-archival documents for the Treaty of Normalization between Japan and ROK (Republic of Korea) : Decolonization and Cold War in Asia.
- 2001 - 2002 Comparative and Theoretical Studies on Politics of Contemporary Nationalism and Ethnicity Problems
- 2000 - 2002 International Comparative Studies of Americanization and Nationalism in a Global Age
- 1995 - 1996 U.S.-Japan Relationship-50 years in the post WWII period
- 1995 - 1996 A Study on the U.S.Policy toward East Asian Regionalism
- 1993 - 1993 The Making of the Post-war Japanese Diplomacy
- 国際環境と戦後日本
- 情報化の進展による国際法秩序の変容
- 情報化の進展による国際法秩序の変容
- アジア太平洋地域の政治変動における米国の位置と役割
- 日本の対外政策と東アジア-信頼醸成へ向けた国際共同研究の可能性
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