- 2019 - 2023 A study on the innovative nature of Seki Takakazu's mathematics: centering on his theory of equations
- 2016 - 2023 東アジア数学史より見た建部賢弘の数学の研究
- 2011 - 2016 Mathematics of pre-modern Japan considered in the Taisei Sankei
- 2010 - 2015 Methods and Logic of Mathematics in Pre-modern Japan
- 2007 - 2008 A Study on Takebe Katahiro's Mathematics
- 2006 - 2008 Research on the History of Mathematics
- 2005 - 2008 建部賢弘の数学
- 2002 - 2005 Global Survey Investigation and Compilation of Japanese Astronomical and Land-survey Materials beiare Meiji Era.
- 2001 - 2004 Research of the History of Mathematics
- 1999 - 2000 Mathematical and Historical Study of Shou Shi Li and its Acceptance in Japan in the Seventeenth Century
- 1999 - 2000 Research on the History of Mathematics
- History of Pre-modern Japanese Mathematics.
- 数学教育
- 近世日本数学史
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