- 2005 - 2006 :日本大学法学部図書館長
- 2005 - 2006 :Director, Library, College of Law, Nihon University
- 2003 - 2004 :日本大学法学部比較法研究所長
- 2003 - 2004 :Director, Institute for Comparative Law, College of Law, Nihon University
- 1980 - -:日本大学法学部教授
- 1980 - -:Professor, College of Law, Nihon University
- 1966 - 1978 :東京大学法学部助教授
- 1966 - 1978 :Associate Professor, Faculty of Law, Tokyo University
- 1963 - 1966 :東京大学法学部助手
- 1963 - 1966 :Assistant, Faculty of Law, Tokyo University
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