- 2023 - 2028 Liberalism and its epistemological foundations in a liberal society
- 2018 - 2023 Basic Construction toward Meta-Study of Constitutional Law: Philosophical Revision over Theoretical Foundation of Constitution
- 2018 - 2022 事実認定的な法的言明の意味論と法的事実の存在論
- 2015 - 2018 Construction of a philosophical foundation of Global Legisprudence by unifying legisprudence and theories of global justice
- 2014 - 2018 メタ規範論を基盤とする法概念論と法価値論の統合的再構成
- 2012 - 2015 Legisprudential Foundation Building for the Legislative System Reform
- 2009 - 2011 Legal-philosophical reconstruction of the study of legislation as
- 2011 - 法概念論のメタ規範論的分析と法命令説の現代的再構成
- 2010 - 法命令説による分析的権利論の規範的法実証主義的再構成
- 2006 - 2008 Public-Philosophical Foundation Building for the Study ofLegislation
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