- 2009/10 - 現在 独立行政法人国立国語研究所 名誉所員
- 2012 - 2015 Nagoya University of Foreign Studies
- 2005/04 - 2009/09 Independent Administrative Institution : The National Institute for Japanese Language
- 2005 - 2009 - The National Institute for the Japanese Language,President
- 2001 - 2008 National Graduate Institute for Policy Studies
- 2001 - 2005 The National Institute for the Japanese Language, Director of the Department of Japanese Education
- 2001 - 2005 Independent Administrative Institution : The National Institute for Japanese Language
- 1998 - 2001 National Institute for Japanese Language and Linguistics
- 1998 - 2001 The National Language Research Institute, Director of the Department of Language Behavior
- 2000 - University of Tsukuba
- 1999 - Waseda University
- 1985 - 1998 National Institute for Japanese Language and Linguistics
- 1985 - 1998 The National Language Research Institute, Chief of the first Section
- 1998 - 大阪大学大学院 非常勤講師(集中講義)
- 1992 - 1996 Tokyo Metropolitan University Faculty of Social Sciences and Humanities
- 1991 - 1996 Tsuda College Faculty of Liberal Arts
- 1991 - Nagoya University School of Letters
- 1990 - 北京日本学研究中心 客員教授
- 1988 - The University of Tokyo Faculty of Letters
- 1984 - 1985 National Institute for Japanese Language and Linguistics
- 1984 - 1985 The National Language Research Institute, Chief Researcher
- 1975 - 1984 国立国語研究所言語行動研究部第1研究室 研究員
- 1975 - 1984 The National Language Research Institute, Research Staff
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