・Member of the Tokyo Metropolitan Committee on the Protection of the Rights of Incapable Adults (1995-1996)

・Member of the Tokyo Metropolitan Committee on the Freedom of Information (1997-1998)

・Member of the Meeting on Risk Management of Bank Group, etc. of Financial System Research Committee (1997-1998)

・Member of the Working Group for the Collective Investment Scheme, the Second Subcommittee of the Sectional Committee on Financial System of the Financial System Council (1999)

・Member of the Working Group for the Improvement of Financial Functions, the Second Subcommittee of the Sectional Committee on Financial System of the Financial System Council (2001-2003)

・Secretary of the Working Group on Secured Finance and Civil Execution, the Legislative Council of the Ministry of Justice (2001-2003)

・Member of the Working Group for Trust, the Second Subcommittee of the Sectional Committee on Financial System of the Financial System Council (2002-2003)

・Expert Member of the Financial System Council (2003-2012)

・Secretary of the Working Group on Secured Transaction in Movables and Chose in Action, the Legislative Council of the Ministry of Justice (2003-2004)

・Secretary and Member of the Working Group on Trust Law, the Legislative Council of the Ministry of Justice (2004-2018)

・Member of the Examination Committee for the Japanese Bar Exam (Civil Law) (2005-2007)

・Secretary of the Working Group on E-registered Claims, the Legislative Council of the Ministry of Justice (2006-2007)

・Member of the Licensed Condominium Manager Examination Committee (2008-2012)

・Member of the Working Group on the Non-Contentious Cases Procedures Act and Domestic Relations Trial Act, the Legislative Council of the Ministry of Justice (2009-2011)

・Secretary of the Working Group on the Civil Code (Law of Obligations), the Legislative Council of the Ministry of Justice (2009-2014)

・Member of the Examination Committee for the Japanese Bar Exam (Civil Law) (2010-2013)

・Director of the Japan Association of the Law of Trust (2011-)

・Member of the Working Group on Hague Convention (The Civil Aspects of International Child Abduction), the Legislative Council of the Ministry of Justice (2011-2012)

・Director of the Japan Association of Private Law (Chief Director from October 2015) (2013-2017)

・Member of the Examination Committee for the Japanese Preliminary Bar Exam (2014-2015)

・Member of the Working Group on the Commercial Code (Transportation Business and Maritime Commerce), the Legislative Council of the Ministry of Justice (2014-2016)

・Member of the Working Group on the Civil Execution Act, the Legislative Council of the Ministry of Justice (2016-2018)

・Advisor to Japan Registration Society (2018-)

・Member of the Working Group on the Civil Code and the Law of Land Registration, the Legislative Council of the Ministry of Justice (2019-2021)

・Member of Committee on Collateral Legislation, the Legislative Council of the Ministry of Justice (2021-)

・Member of Working Group for Examination of CCS Business and Domestic Law, Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry (2022-)