- 2019 - 2023 憲法秩序の領域分化をめぐる法的論証作法の日独比較
- 2018 - 2023 公法と私法の観点を総合した、インターネット上の表現活動への法的規律枠組の探求
- 2017 - 2021 comparative studies of public Laws with historical contexts in the era of globalization
- 2016 - 2020 The possibility of the nuclear law system as sustainable public goods
- 2014 - 2018 Consideration on the Tensions between the Justice between Generations and Democracy
- 2014 - 2017 Reception of Western constitutionalism in China and Japan
- 2012 - 2016 Empowering Non-Profit Transfers by the State and the Design of Public Service
- 2012 - 2015 Studies of the "Kelsen-Renaissance" in German science of public law
- 2011 - 2014 The Research on the Role of the Supreme Court and the Appointement System of Supreme Court Justices in Recent Japan
- 2010 - 2012 Reception and Transformation of European constitutionalism in Asia.
- 2008 - 2010 Legal responsibility of the various actors who take part in the expressive activities in the internet
- 2007 - 2008 The Reception and Developments of Western Constitutional Theory in Asia : the Comparative Research of Japanese and Taiwanese Constitutional Law
- 2003 - 2004 "Rule of Law" and Rechtsstaat - Type and Context of the Government System in the New Century
- 1995 - 1995 国民国家の変遷と憲法による国家の基礎づけの可能性について
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