- 2016 - 2020 The Constitution and the Law of Japan in the Preliterate Era: Constructing a Dialogue between Constitutional Legal History and Archeology
- 2009 - 2011 A Legal-Historical Study on the Ancient and Modern Emperical System
- 2006 - 2008 Modern and Postmodern of civil law
- 2004 - 2007 The Track of self-government in modern Japan. -Higashi-nojiri-mura in Toyama Prefecture-
- 2003 - 2005 Comparison of Histories of Law of Major Civilized Societies : The Land Laws of Western Europe, China, Japan and etc.
- 2001 - 2002 Comparative Study on the relation between civil law and commercial law
- Formation, Development and Transformation of the Modern Law - Comparative Studies of Europe, China and Japan -
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