- 2022 - 2026 議院内閣制と二院制の接合可能性に関する研究-制度・比較・理論からの分析
- 2019 - 2023 Political System Change and Democracy in European Peripheral Countries
- 2018 - 2023 戦後体制(レジーム)とは何であったか--「戦後日本」政治経済史の検証
- 2018 - 2021 Relegitimation of Modern Democracy: New Understanding of Its Election-centric Structure
- 2014 - 2017 A Study of Co-productive Politics overarching Political Theory and Empirical Research for Rivitalizing Democracy
- 2013 - 2017 Comparative studies on political development in mainly smaller European countries and Japan
- 2012 - 2017 Comparative Research on Alteration and Reflection on Possibility of Democracy
- 2013 - 2016 Theoretical enrichment of modern democracy by renovated understandings of political representation
- 2010 - 2014 Changes in Welfare-employment Regime and their Impact on Group Politics in Japan
- 2009 - 2011 The Transformation in the Structure of Party Competition and Party Strategies in Europe
- 2007 - 2011 Comprehensive research on ideas and policy of civil social democracy
- 2008 - 2010 政党類型論との接合による政党システム論の刷新
- 2006 - 2009 Comparative Analysis of Reform Politics in the Conservative Regimes
- 2005 - 2007 日本政治史学と現代政治学・歴史学理論との対話と交流の可能性に関する研究
- 2005 - 2007 Study on Political Regime Changes of Semi-Polyarchies in the Interwar Years
- 2002 - 2004 Theoretical and Empirical Research into the Long-term Change in the Management of the Diet and the Legislative Behavior : Institutional Changes and Behavioral Changes
- 1998 - 2000 Forming the modern political economy regime 1955-65 : roles of political party in Europe and Japan
- デモクラシーの競争理論
- Competitive Theory of Democracy
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