Mr Atsushi Okada > Mori Hamada & Matsumoto > Tokyo, Japan > Lawyer Profile

Mori Hamada & Matsumoto
TOKYO 100-8222

Work Department

Intellectual Property, TMT, Data Protection, Fintech, Life Sciences, AI/IoT and Product Liability




Atsushi Okada is co-head of the firm’s IP, Data Security, Fintech, Healthcare and AI/IoT practice groups and regularly advises on cutting edge technology issues across industries.

He focuses on international and domestic infringement litigation, licensing, data protection, product liability disputes, cyber security, M&A, and other IP/IT related transactions in a broad range of technical fields (including pharmaceuticals, software, machinery, semiconductors and medical equipment). He is also an expert in privacy and global compliance with data protection laws in Japan, Europe, the U.S. and other Asian countries.

His extensive writings include, “Patent Litigation” (Thomson Reuters, 2022), “The Financial Technology Law Review [5th ed.]” (Law Business Research Ltd, 2022), “Overview of Amended APPI” (Data Protection Leader, 2022), “Q&A: Digital Health and Law [2nd ed.]” (Shojihomu Co., Ltd., 2022),  “Legal Affairs for Platform Businesses [2nd ed.]” (Shojihomu Co., Ltd., 2022), “Drone Business and Regulations [2nd ed.]” (Seibunsha Co., Ltd., 2022) and “The Pharmaceutical Intellectual Property and Competition Law Review [2nd ed.]” (Law Business Research Ltd, 2021).




Daini-Tokyo Bar Association (2002), New York State Bar Association (2008)

He also serves as a member of various governmental committees, including the Study Group on AI/Data Contract Guidelines (METI); AI Governance Guideline Working Group (METI); Review Meeting for Smart City Architecture (Cabinet Office); Board of Examiners at Industrial Property Council (Japan Patent Office); Project Team for the Evolution and Implementation of AI (Liberal Democratic Party of Japan); AI Strategy Council (Cabinet Office); Committee for IP Rights in the Age of AI (Cabinet Office); Expert Committee for the Guidelines for Utilization of Generative AI (Tokyo Metropolitan Government); and Working Group of the AI Operator Guidelines (METI).


  • The University of Tokyo (LL.B., 2001)
  • Harvard Law School (LL.M., 2007)
  • with Weil, Gotshal & Manges LLP, Silicon Valley (2007-2008)

Lawyer Rankings

Japan > Fintech - Independent local firms

Praised for its ‘longstanding strong connections’ with Japanese regulatory authorities, Mori Hamada & Matsumoto assists domestic and international clients with issues such as the implementation of payment services, the building and operation of exchange platforms for crypto products and regulatory assistance for crowdfunding services. The team also wins plaudits for its handling of digital transformation mandates for financial institutions and financial services intermediation work. Co-head of the practice Masakazu Masujima, a council member of numerous Japanese Government policy committees, is a key contact for mandates involving money transmissions and crypto-assets. Fellow co-head Takane Hori centres her practice on IT and regulated transactions. Atsushi Okada completes the leadership team. Masayuki Ishibashi is embedded in work relating to security token offerings, while Masafumi Masuda is an expert on NFTs. Katsuya Terai is another name to note.

Japan > TMT: Independent local firms

(Leading individuals: Bengoshi)

Atsushi Okada – Mori Hamada & Matsumoto

Mori Hamada & Matsumoto continues to handle the full spectrum of TMT-related matters. The group displays vast experience in multinational restructuring, high-value transactions, regulatory matters, and IP litigation. The exceptional team is co-led by partners Koichiro Iida, Atsushi Okada, and Hiromi Hayashi. Iida advises a number of banks and tech companies on regulatory issues concerning data protection, Okada is well placed to handle mandates involving autonomous vehicles, drones, and digital health regulation, and Hayashi is known for advising on license requirements under the Radio Wave Act. For matters on cybersecurity, IT, and data protection, Daisuke Tsuta comes highly recommended. Norihito Sato has broad expertise in the automotive sector.

Japan > Intellectual property: Independent local firms

(Leading individuals: Bengoshi)

Atsushi OkadaMori Hamada & Matsumoto

Headquartered in Tokyo with a broad international scope, Mori Hamada & Matsumoto is recognized for its comprehensive IP service and depth of experience with infringement cases involving patents, designs, trade marks, copyrights and invalidation trials. Recent expansion of the practice into China, involving local IP prosecutions and contentious matters, exemplifies the firm’s globalist outlook whilst maintaining its impressive client roster of domestic cross-sector companies. Yutaka Miyoshi, who has broad experience in complex, cross-border IP litigation, co-leads the team with Yoshifumi Onodera, who leverages his academic background in chemistry and biology to take lead on disputes requiring a high level of technical expertise. They are joined by Atsushi Okada, who handles disputes and transactions across a broad range of fields, and Tetsushi Kamimura, a specialist in disputes and copyright infringement cases in entertainment, TV broadcasting and internet-related technologies. Hideaki Kuwahara is notable for his expertise in IT-related disputes and handles IP litigation.