- 2023 - 2027 Fostering Co-creation of Qualitative Comparative Analysis (QCA) in Political Science: Time-orientation, Conditionality, and Good Practices
- 2022 - 2026 The Effects of Multiculturalism, Smart Technologies, and Nudging on the Welfare Systems of Highly Ageing Societies: A Comparative Study
- 2021 - 2026 中国の改革開放萌芽期の再検討:メディア空間からみた旧東欧との分岐
- 2018 - 2022 1970年代ヨーロッパにおける民主主義の「リベラル」化:個人化・権利化・司法化?
- 2016 - 2020 少子高齢化社会における福祉システムの予防化・委任化・脱領域化に関する国際比較研究
- 2014 - 2019 European New Order after the WWII
- 2014 - 2018 Comparative analysis on labor, religious, and judicial policies in multicultural societies
- 2014 - 2018 Developing Analytical Approaches to the EU Judicial Politics
- 2012 - 2015 Comparative Studies of European Nation-state Building and Regional Integration in the Interwar Period
- 2011 - 2014 Comparative analysis of the language rights, social rights, and voting rights in multicultural societies
- 2011 - 2013 Stability and Effectiveness in Party Government: The Cases of Volatile Party Systems and Semi-Presidentialism in Central and Eastern Europe
- 2009 - 2011 A study on the transformation of contemporary democracies and partyorganizations
- 2009 - 2011 The Transformation in the Structure of Party Competition and Party Strategies in Europe
- 2008 - 2010 Comparative analysis of the policies of welfare, education, and human rights in multiculral societies
- 2008 - 2010 Gender Dynamics of International Regime
- 2006 - 2008 Functions and Legitimacy of the EU Participatory Governance Involving Civil Society Organizations
- 2005 - 2008 Political and Economical Changes in the International Relations around the Balkans
- 2004 - 2007 Interaction between European law and domestic law of European States
- 2003 - 2006 International comparisons of the rights of cultural minorities: Integration of philosophical and historical approaches
- 2003 - 2005 Comparing the Core-Executives in the Changing Period
- 2003 - 2005 Positive Analysis of the "Democratic" Governance in the European Integration
- 2003 - 2005 EUのガヴァナンス形成における社会アクターの戦略と機能
- 2001 - 2002 Comparative Politics of Social Capital
- 1997 - 1999 Globalization and Universalism in Regions : A Link to the 21st Century
- 1997 - 1998 New Electoral System and Party Realignment in Japan
- 1997 - 1997 ヨーロッパにおける民主制の変容と民主制論の新展開
- 1994 - 1994 ヨ-ロッパにおける「民族紛争」の政治過程
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日本選挙学会
, JAPAN ASSOCIATION OF INTERNATIONAL RELATIONS
, The European Union Studies Association Japan
, JAPAN ASSOCIATION FOR COMPARATIVE POLITICS
, JAPANESE POLITICAL SCIENCE ASSOCIATION
, Council for European Studies