- 2018 - 2021 Property law for a sustainable society
- 2017 - 2020 Study of the basic principles of trusts
- 2014 - 2017 Study of the law of non-profit incorporated associations
- 2014 - 2017 Property as plural models-concept of legal property in post-modern age-
- 2012 - 2017 Modernization of Property Rights and Reconstruction of Property Law
- 2011 - 2014 The functions of documents in creations of private legal relationships and the roles of legal professions
- 2007 - 2011 Law and Ordering of Market and Society in the Post-"Structural Reform" Era-A New Legal System for Liberty and Communality-
- 2008 - 2010 Reorientation of Notary-system from legal comparative point of view-the past, present and future of legal profession
- 2006 - 2009 Reconstruction of Administration of Property
- 2006 - 2008 Leagal Effects in Simultaneous Existence of Mandate and Trust.
- 2003 - 2005 The rights and liabilities of mandator, consigner and others.
- 2000 - 2002 Method of Comparative Study in Contract Law
- 1999 - 2000 私法における信頼保護法理の研究
- 1993 - 1996 Law and Rhetric
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