Awards
Keiji Tonomura
Partner
Tokyo Office
- Languages
- Japanese, English
- Qualifications
- 2007(-2012), 2014, Japan (Dai-Ichi Tokyo Bar Association)
Keiji Tonomura is a partner at Nagashima Ohno & Tsunematsu. His practice focuses on mergers and acquisitions and intellectual property and information technology related transactions and counseling. He has extensive experience representing global and local clients on mergers and acquisitions, joint ventures, strategic alliances and other complex business transactions as well as data security and data privacy issues across a range of industry sectors, with a particular focus on the TMT (technology, media and telecoms) sectors and the new business fields generated by the development of emerging technologies, such as sharing economy, Fintech, IoT and AI. He also regularly provides global and local clients with corporate governance related and other general corporate advice.
Practice Areas
Education/Professional Experience
- 2004
- Kyoto University (LL.B.)
- 2006
- Kyoto University Law School (J.D.)
- 2007 -
- Nagashima Ohno & Tsunematsu
- 2013
- Columbia Law School (LL.M., Harlan Fiske Stone Scholar)
- 2013 - 2014
- Kirkland & Ellis LLP, Chicago
- 2018 - present
- Partner, Nagashima Ohno & Tsunematsu
Awards
Seminars
-
October 3, 2025 (Fri) 14:30 - 17:30Recent Legal Topics in Technology Field 2025
- Keiji Tonomura
- Yukiko Konno
- Minh Thi Cao Koike
Nagashima Ohno & Tsunematsu Tokyo Office
- Technology
- AI and Robotics
- Internet/IT Services/Cloud
-
June 23, 2025 (Mon) 14:00 - 16:00Generative AI and Law -The 3rd JaDHA Open Seminar
- Keiji Tonomura
- Masanori Tosu
- Mamu Inoue (JaDHA)
Nagashima Ohno & Tsunematsu Tokyo Office / Online (Live)
- Pharmaceutical and Healthcare
- Medical, Pharmaceutical and Life Sciences
-
May 22, 2025 (Thu) 15:00 - 18:00NO&T Europe Week – Day3: Compliance, Digital and Tax in Europe
- Kiyoshi Honda
- Shigeki Minami
- Keiji Tonomura
Nagashima Ohno & Tsunematsu Tokyo Office
- Dispute Resolution
- Disputes in Foreign Jurisdictions
-
March 11, 2025 (Tue) 11:00 - March 18, 2025 (Tue) 23:59Recent Developments in AI Laws and Regulations Featuring Keiji Tonomura, Ranked No. 1 in the “AI, Tech, and Data” Category (Nikkei Lawyer Rankings 2024)
- Keiji Tonomura
- Ryuhei Itaya (MNTSQ CEO)
Online (On-Demand)
- Technology
- AI and Robotics
- Digital Transformation (DX)
Publications
-
Articles
TMT: Japan Enacts Active Cyber Defense Law
(August 2025)
Keiji Tonomura, Yoshiteru Matsuzaki (Co-author)
- Technology
- AI and Robotics
- Telecommunications
-
Articles
Chambers Global Practice Guides Artificial Intelligence 2025 Japan – Law & Practice
(June 2025)
Keiji Tonomura, Yukiko Konno, Minh Thi Cao Koike, Yoshiteru Matsuzaki (Co-author)
- Technology
- AI and Robotics
- Data and IoT
- Data Protection and Privacy
-
Articles
TMT: Bill of AI Act in Japan
(April 2025)
Keiji Tonomura, Akira Komatsu (Co-author)
- Technology
- AI and Robotics
- Telecommunications
-
Articles
Chambers Global Practice Guides Fintech 2025 Japan – Trends & Developments
(April 2025)
Keiji Tonomura, Shu Sasaki, Kazuyuki Ohno, Otoki Shimizu (Co-author)
- Technology
- Finance
- FinTech
Featured Topics
Topics
-
Announcements
Keiji Tonomura appointed as the Expert Member of Study Group on Data Contract Guidelines in Agricultural Sector, Ministry of Agriculture, Forestry and Fisheries.
-
Announcements
Keiji Tonomura appointed as a member of Working Group for Study Group on Data Contract Guidelines, Ministry of Economy, Trade and Industry.
-
Announcements
Announcing New Partners and Counsel of NO&T