- 2011/04 - 現在 Professor, Major in International Japanese Studies, Graduate School of Humanities, Hosei University
- 1996/04 - 現在 Professor, Major in Philosophy, Graduate Scholl of Humanities, Hosei UNiversity
- 1996/04 - 現在 Professor, Faculty of Letters, Hosei University
- 2018/09 - 2018/09 Invited professor, Faculty of Letters, Kyoto University
- 2009/04 - 2017/03 Director, Hosei Program of EU Erasmus Mundus "Europhilosophie"
- 2008/04/01 - 2014/03/31 Director, Hosei University's Research Center for International Japanese Studies
- 2008/04 - 2014/03 Director, Hosei University's Research Center for International Japanese Studies
- 2012/01 - 2012/01 Invited professor, Faculty of Philosophy, University of Paris West Nanterre
- 2010/03 - 2010/03 Invited Professor, Faculty of Philosophy, Lyon 3 University
- 2007/09 - 2007/09 Invited Professor, Fculty of Letters, Kyoto University
- 2004/04 - 2005/03 Invited Researcher of Institut d'Histoire et de Philosophie des Sciencies et des Techniques(IHPST)
- 2000/04/01 - 2001/03/31 Invited professor, Garduate School of Humanities, Seijo University
- 2000/04 - 2001/03 Invited professor, Garduate School of Humanities, Seijo University
- 1999/04 - 2001/03 Invited professor, Faculty of letters, University of Tokyo
- 1996/04/01 - Professor, Major in Philosophy, Graduate Scholl of Humanities, Hosei UNiversity
- 1992/04 - 1996/03 Associate professor, Faculty of Letters, Hosei University
- 1993/04 - 1995/03 Invited professor, Faculty of Letters, Gakushuin University
- 1989/04 - 1992/03 Full-time lecturer, Faculty of Letters, Hosei University
- 1986/11 - 1989/03 Researcher, Faculty of Letters, University of Kyoto