Tokyo J Law Office

Eriko Matsuno · Est. 2010

en.ben5.jp/

Founded in 2010 by Eriko Matsuno, who spent a decade at Morgan Stanley and Nagashima Ohno Tsunematsu before specializing in international family law. Served on the founding board of WealthNavi (now publicly traded) and currently serves as its outside director. Handles international divorce, custody disputes, Hague Convention child return cases, and ADR/mediation. Also serves as arbitrator at Tokyo Bar Association for international family disputes.

LawAsia Member Tokyo Bar Arbitrator WealthNavi Outside Director

Why choose this firm

  • Morgan Stanley and Nagashima Ohno background — rare corporate-to-family law pivot
  • International family dispute arbitrator at Tokyo Bar Association
  • Deep expertise in Japan's new joint custody law (effective April 2026)
EnglishJapanese
International DivorceCustody DisputesHague ConventionADR/MediationFamily Law Arbitration