- 2015 - 2018 Mechanism of generating inequality in lifecouse mobility
- 2012 - 2015 Lifecourse events, stratification and Disparities
- 2009 - 2011 Inequality in Men and Women from the Perspective of Social Stratification and Life-course Mobility
- 2008 - 2010 Socialization Network and Educational Attainment in Japan and Korea.
- 2003 - 2008 Out-of-Court Dispute Resolution by Administrative and Private Agencies
- 2005 - 2007 Temporal Changes of Inequality and Structure in Status Attainment
- 2002 - 2004 Changes of Unequal Structure of Stratification in Modern Japan
- 2002 - 2004 Research on Changing Stratification System and Its Reorganization in Contemporary Japan
- 1998 - 2000 Career Mobility of the Judges
- 1996 - 1997 Qualitative Comparison by Boolean Approach
- 1992 - 1994 Theorical and Empirical Study on the Modern Structure of Social Stratification
- 1986 - 1987 Study of Computer Program for the Analysis of Social Mobility Data
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