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小口 光
小口 光


  • Partner
  • Tokyo
  • ”Hikaru Oguchi is based in Tokyo and is best known for representing Japanese corporates in their investments into Vietnam. She is regularly involved in large cross-border mandates, with clients remarking upon the quality of advice that she provides.

    Chambers, Corporate/M&A - Japan (Global 2022)

Hikaru is a partner leading our ASEAN practice, focusing on cross-border M&As and commercial transactions. She also provides strategic advice on dispute and risk management matters to her clients by leveraging her profound expertise and network in the region.

Hikaru took the initiative in launching the firm’s ASEAN practice in 2010, and since she has supported various Japanese and international companies' new entry, expansion of their business, strategic investment, group restructuring, risk management, disputes, as well as exit deals. With her deep understanding of the nature of issues, as well as the business background and cultural and political context in each country, she is known for providing practical advice by working closely with the clients' business team in each jurisdiction. As a key member of our Diversity, Equity & Inclusion Committee, she has played a key role in many of our diversity, equity and inclusion initiatives, particularly over the past few years. Our firm was named the winner of the region’s Law Firm: Diversity & Inclusion Category at FT Innovative Lawyers Awards Asia-Pacific 2021 and winner of Outstanding Firm for D&I (Regional) at Chambers D&I Awards Asia-Pacific 2020.

Awards & Rankings

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

Professional Experience

Outside Director (Audit and Supervisory Committee), DCM Holdings Co., Ltd.
Lecturer, Gakushuin University for Asian Business Law 
Outside Corporate Auditor, DCM Holdings Co., Ltd. 
Partner for Vietnam Offices 
Outside Corporate Auditor, Asteria Corporation 
Hanoi Office Partner 
HCMC Office Partner 
Lecturer, The University of Tokyo 
Deputy Director,The Ministry of Foreign Affairs, Aid Policy Division, International Cooperation Bureau 
Legal Adviser for the Technical Assistance Seminar (Competition Law) in Vietnam, Japan International Cooperation Agency (JICA) 
Legal Adviser for the Legal and Judicial Development Project in the Lao People's Democratic Republic JICA.