Hiroyuki heads our international dispute resolution practice. He specializes in international commercial litigation and arbitration. He has represented many international clients, including manufacturers, banking and securities firms, insurance companies, and news media, in dispute resolutions involving M&A disputes, antitrust laws, corporate governance, insurance laws, intellectual property, defamation, joint ventures, licensing, construction, and other commercial matters, as well as international bankruptcy. He has been involved in a number of international arbitrations as counsel, sole-arbitrator, co-arbitrator, or chairman, including before the ICC, JCAA, AAA-ICDR, VIAC, KCAB, and SIAC.

Hiroyuki serves as an executive director of the Japan Association of Arbitrators, was a vice-chair of the Arbitration Committee of the IBA Legal Practice Division, and was a Co-Chair of the Dispute Resolution and Arbitration Committee at the IPBA from 2016 to 2020. From 2013 to 2016, he taught international arbitration at the University of Tokyo, School of Law as visiting professor. Since 2013, he has been a member of the SIAC's Court of Arbitration. He is also a member of the International Court of Arbitration of the ICC and Since 2018 he is a Council member of the ICC Institute of World Business Law.

Recent activities


The Legal 500 Asia-Pacific 2021: Outstanding Results for Nishimura & Asahi



Chambers Asia-Pacific 2021: Top rankings for Nishimura & Asahi



IPBA Webinar - ICSID & UNCITRAL Draft Code of Conduct for Adjudicators in Investor-State Dispute Settlement



Harvard Law School (LL.M.)
The University of Tokyo (LL.B.)

Professional experience

2018 -
Council Member, ICC Institute of World Business Law
2018 -
Member of the International Court of Arbitration of the ICC
2017 - 2018
Alternate member of the International Court of Arbitration of the ICC
2016 -
Fellow of the Chartered Institute of Arbitrators (FCIArb)
2014 -
SIAC's panel of arbitrators for Intellectual Property disputes, Singapore International Arbitration Centre (SIAC)
2013 - 2016
Visiting Professor (International Commercial Arbitration), School of Law at the University of Tokyo
2013 -
Member of SIAC's Court of Arbitration, Singapore International Arbitration Centre (SIAC)
2012 -
Arbitrator of the Vietnam International Arbitration Centre
2011 - 2012
Lecturer, Keio Law School
2011 -
Certified arbitrator of CAA, The Chinese Arbitration Association,Taipei
2010 - 2017
Auditor of the Board, MS&AD Insurance Group Holdings, Inc.
2010 -
Arbitrator on the Panel of Arbitrators, The Korean Commercial Arbitration Board (KCAB)
2009 - 2010
Examiner, The Japanese Bar Examination (Commercial Law)
2009 - 2010
Member, IBA Arbitration Committee, The Rules of Evidence Subcommittee
2008 -
Arbitrator, The Japan Commercial Arbitration Association
2008 - 2010
Lecturer, Sophia Law School
2008 - 2010
Special member, The Legislative Council of the Ministry of Justice on legislation of international jurisdiction rules
2008 - 2020
Outside Statutory Auditor, Showa Denko K.K.
2007 -
Director, The Japan Association of Arbitrators
2007 - 2010
Outside Corporate Auditor, Nissay Dowa General Insurance Co., Ltd.
2007 - 2008
Vice-Chair, International Bar Association, Legal Practice Division, Arbitration Committee
2006 - 2010
Inter-Pacific Bar Association, Committee Vice-Chairperson, Dispute Resolution and Arbitration
2005 - 2011
Special Member of the Financial System Council (Member of the Working Group on Reform of TOB System)
2005 - 2006
Secretary, International Bar Association, Legal Practice Division, Arbitration Committee
2003 - 2005
Coordinator of the Legislative Council of the Ministry of Justice (Modernization of Private International Law)
1992 - 1993
Cleary Gottlieb Steen & Hamilton LLP, New York