Profile of Attorney


  • The Legal Training and Research Institute of the Supreme Court of Japan, 2006-2007
  • Seikei University J.D., 2006
  • Waseda University L.L.B., 1996, L.L.M., 1998
  • Waseda University High School, 1991
  • Foreign Exchange Student at Waverly High School in Michigan, the United States, 1989-1990

Professional Admissions

Japan (2007)

Professional Admissions

  • Member of First Tokyo Bar Association (2007- present)
  • Member of Lawyers Network for Foreigners (present)
  • Associate Member of Japan In-house Lawyers Association (present)
  • Member of Corporate Compliance Committee sponsored by Economic Legal Research Institute (Keizai Horei Kenkyukai) (present)
  • Member of Attorney System Reform Committee (International Affairs) (present)
  • Legal Counsel for Asia at a global leading software company (2010)
  • Associate at Ashurst Tokyo Law Office
    (presently “Ashurst Horitsu Jimusho Gaikokuho Kyodo Jigyo” which is associated with Ashurst LLP)(2008-2009)
  • Associate at Spring Partners (2007-2008)
  • Worked in Legal Dept. of Mitsubishi Corporation (1998-2004)
  • Secretary-General of Seikei Law School Alumni (2006-2019)
  • Lecturer at Seikei University (2011)
  • Special Lecturer for Legal & Compliance at Tokyo Institute of Technology, Academy for Global Leadership(2012-2015)
  • Outside Audit & Supervisory Board Members of Ubiquitous AI Corporation (JASDAQ) (2016-Present)
  • Outside Audit & Supervisory Board Members of OTSUKA Corporation(2020-Present)
  • Established Kollect Partners as a partner(January 2022)


Japanese (first language)
English (fluent written and spoken, TOEIC 955)

Publications / Lectures

  • “EU competition law: new block exemption and guideline on vertical restraint and its impact on distributorship agreements of Japanese companies” (International Business Law and Practice (Kokusai Shoji Homu) Vol.37. No.12 (2009)) (co-author)
  • “Dictionary of Finance Law Terms” (Economic Legal Research Institute, August 2010) (co-author),
  • Academic Advisor at Waseda Law School (2009)
  • Lecturer at Seikei University

Major Areas of Practice

For Companies

  • – General corporate Cross-border transactions
  • – Intellectual property rights
  • – Domestic and cross-border civil litigation
  • – Domestic and cross-border criminal litigation
  • – Anti-trust and competition law (including Japanese Antimonopoly Act,EU competition law and US anti-trust law)
  • – Debt collection

For Individuals

  • – Inheritance
  • – Divorce and child custody
  • – Labor issues
  • – Road traffic accidents
  • – Bankruptcy
  • – Domestic and cross-border civil litigation
  • – Domestic and cross-border criminal litigation
This website is created for Mr. Katsumasa MINAGAWA (Partner of Kollect Partners Law Office) only and not the official website of Kollect Partners Law Office.


Please do not hesitate to ask by a telephone and mail.

Weekday AM 9:00 - PM 6:00

Tel : 03-3370-2521

Contact Form


  • Katsumasa Minagawa


Kollect Partners

The Parkrex Yoyogi 2F, 1-47-9
Yoyogi, Shibuya, Tokyo