In Department of Math.
- 1999: Chairman of Department of Math.
- 2001--: Commitee member of future of Fac. of Sci.
- 2002--: Commitee member of renovation of the buildings.
In Faculty of Science
- 2004--2006: Head of commitee of Puiblic Relation
- 2000-2001: Head of commitee of budget
Mathematical Society of Japan
- 1997--2004: Member of scientific committee
- 2000-2003: Chairman of scientific committee
- 1999--: Member of committee of division of algebra
- 2000--2001: Councilor
- 2001--2002: Member of board of directors
Japanese Association of Integrated Science and Education