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Masao Koide

Lawyer : Japan

Profile and Expertise

After being admitted to Tokyo Bar Association, Masao joined one of the largest IT companies in Japan as an in-house lawyer. During that time, he engaged in a wide range of corporate legal matters, focusing on legal support for various IT services, such as media, e-commerce, advertising, Fintech, as well as M&A support.

He is well familiar with intellectual property laws including Copyright Act, Trademark Act, various Internet business regulatory laws, including Act against Unjustifiable Premiums and Misleading Representations, Consumer Contract Act, Specified Commercial Transactions Law, Payment Service Act, Act on Regulation of Transmission of Specified Electronic Mail, Electronic Consumer Contract Act, Act on Limitation of Liability of Providers, and Telecommunications Business Act, and other laws. Furthermore, he has extensive experience in large-scale business tie-ups, joint venture projects, and state-of-the-art technology-related projects such as cryptocurrency transactions and digital money payments. He has an established reputation for solving cases with complicated legal issues. He is also certified as Registered Information Security Specialist and handles many cases related to information and data processing laws including Act on the Protection of Personal Information. His experience as an in-house lawyer has enabled him to understand Japanese corporate culture, accurately grasp the demands of corporate clients, and provide the most practical advice.
Currently, he is working at One Asia Lawyers Tokyo Office and Thai Office. He offers a variety of legal support, mainly on general corporate legal matters, including IT legal matters, compliance with personal information and data regulations, support for Japanese companies’ entry into the Southeast Asian markets and Southeast Asian companies’ entry into the Japan market, M&A, cryptocurrency transactions, and ICOs (Initial Coin Offerings).

  • Experience
  • Publications
  • Seminars
  • Newsletter
  • Regulation review for a major Japanese IT company’s entry into the Thai market
    Regulation review for cross-border services relating to a Japanese e-commerce enterprise’s entry into the Thai market
    Regulation review for third-party payment business relating to a large Japanese IT company’s entry into the Thai market
    Reorganisation project involving major Japanese companies in Singapore
    Drafting an agreement for a Japanese major company for its support services for Japanese companies entering into the Thai market
    Regulation review and drafting of an agreement for cross-border services in Thailand by a major Japanese education company
    Joint venture project involving a major Japanese manufacturer’s entry into the Laos market
    Regulation review and drafting of an agreement for privacy and data transfer of a major Japanese IT company
    Research on intellectual property such as copyrights and others by a major Japanese financial institution
    Regulation review for the implementation of ICO by Singaporean companies in Japan
    Acquisition of a Japanese cryptocurrency exchanger by a Singaporean company
    Supporting regulatory compliance of a cryptocurrency exchanger in Thailand, etc.

  • “Management of Asian Subsidiaries Led by Legal Department - No. 4 How to Establish a System to Comply with Personal Data Protection Acts in Asian Counties”, Business Law, co-authored series, June 2019, CHUOKEIZAI-SHA, Inc.

  • “Legal Considerations in Developing E-Commerce Services in ASEAN” (hosted by ASEAN-Japan Centre in May 2018)
    “Seminar on Data Regulation and Global ICT for ASEAN Countries” (hosted by IIJ Global Solutions Inc. in September/November 2018 and March/June 2019)
    “Seminar on the Protection of Personal Information in Europe, Japan and ASEAN Countries” (hosted by Japan Management Association, March 2019)
    ”The 8th Case Seminar on the Management Consultation” (hosted by Tokyo SME Support Center -Thailand branch office- , October 2019)
    ”The Regulation of Privacy Data in Asean”(hosted by ASEAN-Japan Centre, December 2019)
    “IT Solutions for the Start of the PDPA(Personal Data Protection Act)” (hosted by KDDI Thailand, January 2020)
    ”Seminar on the Protection of Personal Information in Thailand” (hosted by PERSONNEL CONSULTANT MANPOWER (THAILAND) CO., LTD., January 2020)


2008 Graduated from Keio University Faculty of Law
2012 Completed Graduate School of Law at Chuo University (J.D.)
2013 Admitted to the bar
(Tokyo Bar Association)
2014 Joined Yahoo Japan Corporation
2017 Joined One Asia Lawyers Tokyo Office
2018 Certified as Registered Information
Security Specialist (No. 010838)

Admitted/Professional Experience

    Tokyo Bar Association


Japanese, English


03-6550-9000 (Tokyo)
+66-6-1780-1515 (Thailand)