- 1989 - 2006 Rikkyo University College of Arts
- 1989 - 2006 Professor,Department of History,College of Arts,RIKKYO UNIVERSITY
- 2006 - - 立教大学文学部史学科日本史学専修 教授
- 2006 - - Professor,Department of History, Course of Japanese History,College of Arts,RIKKYO UNIVERSITY
- 1986 - 1989 Rikkyo University College of Arts
- 1986 - 1989 Associate Professor,Department of History,College of Arts,RIKKYO UNIVERSITY
- 1977 - 1986 東京大学史科編纂所 助手
- 1977 - 1986 Full-time Research Assistant
- Rikkyo University College of Arts, Department of History Course of Japanese History Professor
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