- 2021 - 2026 Going Left or Right?: Comparative Global Populism
- 2017 - 2021 Global populism in comparative perspective
- 2016 - 2021 Regional Integration from a Political Economic Perspective
- 2016 - 2020 Practical Science of International Mobility: Social Capital and Work, Life, and Health of Migrants
- 2014 - 2017 A Social History of Catholicism in Modern European Society
- 2013 - 2017 Changing Conservative Politics in Europe
- 2012 - 2016 Change of the modern Japanese historical image in foreign countries.
- 2010 - 2012 Christian Democracy in Western Europe: Crisis or Innovation?
- 2006 - 2009 Comparative Analysis of Reform Politics in the Conservative Regimes
- 2005 - 2007 オランダにおけるポピュリズム政治の出現-その背景・構造・イデオロギー
- 2003 - 2004 Comparative Study on Rise of Radical Right Populist Parties and European Integration : Changing Patterns of Party Competition and Europeanization
- 2002 - 2004 オランダモデルの政治学-オランダ社会民主主義における政治理念の転換と政策革新-
- 2001 - 2002 Research on the Post-Neo-Conservatism of EU Countries in the 21st Century
- 1999 - 2000 The Organaizational Transformation of Political Parties under the EU integration
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