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Atsumi & Sakai

Work +81 3 5501 2111
Fax +81 3 5501 2211
London, Tokyo

Takafumi Ochiai

Work +81-(0)3-5501-2361
Atsumi & Sakai

Work Department

Corporate, Litigation, Arbitration, Insolvency, Business Revitalization, International Practice, Risk Management, Innovation, Data protection, Financial regulation, Healthcare, M&A




Mori Hamada & Matsumoto (October 2006-August 2015)


Japanese, English and Chinese.


Daini Tokyo Bar Association
Deputy Director-General of Japan Association of Arbitrators (April 2010-)
Member of the Research Committee on Business Recovery in Asia, Japanese Association for Business Recovery (September 2010)
Deputy Director-General of Japan Association of Arbitrators (January 2014-), Vice Chairman of Affairs Finance Committee (March, 2016-)
Member of steering committee of Arbitration Center, Daini Tokyo Bar Association (April 2014-)
Vice-Chairperson of steering committee of Arbitration Center, Daini Tokyo Bar Association (April 2015-)
Member of steering committee of Young Japan Association of Arbitrators (YJAA) (October 2015-)
Member of the dispute-settlement committee of the Trust Companies Association of Japan (December 2015-)
Advisor to Incubation & Innovation Initiative (III) (February 2016-)
Vice-Chairperson of International Committee, Daini Tokyo Bar Association (April 2016-)
Leader of Keio University Fine Consortium's "AI and the Law" committee (April 2016-)
Member of the Central Board on Intellectual Property Rights of the Japan Federation of Bar Associations (JFBA) (June 2016-)
Member of a project run by the Council on Competitiveness-Nippon (COCN) entitled “The Coming Ultra-Smart Society through Negotiation, Cooperation and Coordination Between AI Systems” (July 2016-)
Member of the subcommittee on Impact and Risk Assessment of the "Conference toward AI Network Society" of the Ministry of Internal Affairs and Communications (October 2016-)
Secretary General of the subcommittee of the Fintech Association of Japan (October 2016-)
Legal adviser to the Japan Blockchain Association (January 2017-)
Member of the study group "Innovation and Laws" (February, 2017-)
Member of "FINO-MENTORS" of the FINOVATORS for Financial Innovation ecosystem (March 2017-)
Multi-stakeholder Process Member of  the Revised "JIPDEC Privacy Policy" formulated by the Japan Information Processing Development Center (JIPDEC) (April 2017-)
Member of the experts committee of the Japan Intellectual Property Arbitration Center (May 2017-)
Representative of the Working Group on the Operation and Law for the Development Meeting on Guidelines for Remote Psychiatric Practice, of the Japanese Initiative for Diagnosis and Treatment Evaluation Research in Telepsychiatry (J-INTEREST) (May 2017-)
Board member of the Japan Medical Venture Association (May 2017-)
Member of the International Organization for Standardization and Technical Committee (as asecretarial general of the subcommittee of the Fintech Association of Japan) (June 2017-)
Counselor for the AI Group, Tokyo Bar Association (July 2017-)
Auditor for the Data Trading Alliance (DTA) (November 2017-)
Board member of the Japan Association for Financial APIs (November 2017-)
Member of the Open API Promotion Study Group of the Japanese Bankers Association (November 2017-)
Committee member of the “Council on remote home health care utilizing high definition video technology” for the Ministry of Internal Affairs and Communications (December 2017-March 2018)
Member of METI’s “Committee to Discuss the Legal System for Blockchain”, “Field of Medicine, Nursing Care and Healthcare”, “Field of Logistics, Supply Chain and Mobility”, and Committee on “Cross-sectoral Theme” (December 2017-March 2018)
Member of the Ethical Review Board for Shonan Keiiku Hospital, Medical Corporate Body Ken-Iku-Kai (January 2018–) 
Member of the "Guidelines Review Committee for Medical Treatment with Information and Communication Equipment", the Ministry of Health, Labour and Welfare (as a board member of the Japan Medical Venture Association) (February 2018-)
Board member of ISO/TC 307 Japanese National Committee (April 2018-)
Secretary of the Committee on Lawyers Operational Reforms (IT Issues Review PT), the Japan Federation of Bar Associations (June 2018-)
Member of the Innovative Technology/Businessmodel Evaluation Committee for Regulatory Sandbox in Japan, the Cabinet Office (August 2018-)
Temporary Special Advisor (part-time) to the Minister’s Secretariat, Ministry of Economy, Trade and Industry (September 2018-)
Ministry of Economy, Trade and Industry (September 2018-)
Board member of the Real Estate Tech Association for Japan (RET) (September 2018-)
Member of the "Working Group on Health and Medical Care, Study Group for Ideal Approaches to a Certification Scheme Concerning Functions of Information Trust" of the Ministry of Internal Affairs and Communications (October 2018-)


Keio University (B.S., 2004)
The Legal Training and Research Institute of the Supreme Court of Japan

Japan: Banking and finance

Banking and finance ‚Äď Independent local firms

Within: Banking and finance ‚Äď Independent local firms

Atsumi & Sakai has been advising startups, IT vendors and financial institutions on the increasing presence of new technologies in the banking and insurance sector, while also maintaining a strong traditional financing, lending and asset finance practice. The team continued to expand its ranks with the addition of Akimoto Kawamura from Citigroup and Michiro Suenaga from Sidley Austin Nishikawa Foreign Law Joint Enterprise, as well as the promotion to partner of Kenichi Tanizaki. The Fintech Association of Japan recently appointed the group to assist with the drafting of an agreement on the use of a bank API with a software vendor, and Takafumi Ochiai teamed up with Yuri Suzuki to provide ongoing counsel the Japan Blockchain Association with regards to virtual currency exchange regulations. In further highlights, Bonnie Dixon oversaw a high-value senior secured asset-based revolving credit facility in connection with a corporate acquisition, and Ochiai represented a bank in the creation of distributed securities using block chain and ICOs.

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Japan: TMT

TMT ‚Äď Independent local firms

Within: TMT ‚Äď Independent local firms

The ‚Äėprompt and responsive‚Äô Atsumi & Sakai¬†fields¬†experienced¬†domestic and international¬†lawyers, and¬†includes¬†an¬†innovation¬†practice¬†group¬†which focuses on the key emergent areas of¬†fintech, Internet of Things (IoT) and¬†artificial intelligence¬†(AI).¬†Yuri Suzuki, who heads the fintech team, is¬†assisting Mitsubishi UFJ Financial Group with the business plans, prototypes, alliances and roll out process¬†for the company‚Äôs Digital Accelerator Program, while the IoT and AI team is jointly led by Masataka Hayakawa, Hiroyuki Sanbe¬†and Takafumi Ochiai.¬†The ‚Äėapproachable, supportive and knowledgeable‚Äô Chie Kasahara¬†leads the TMT department, which also¬†handles¬†the¬†registration, protection, use and licensing of patents, model utility rights, design rights, copyrights and trade marks.

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Legal Developments in Japan

Legal Developments and updates from the leading lawyers in each jurisdiction. To contribute, send an email request to
  • Taking control of a Japanese publicly listed company:

    Introductory notes for successfully completing an M&A
  • Yuasa and Hara Business Law News

    Contents of the Issue Law on liability for breach of contract Review on the amendment to the cabinet office order on Corporate Disclosure

    The Minister for Justice, Alan Shatter (‚Äúthe Minister‚ÄĚ), has published the Criminal Justice Bill 2011 (‚Äúthe Bill‚ÄĚ). The main purpose of the Bill is stated to be ‚Äú‚Ķto amend the criminal law to improve certain procedural matters and strengthen Garda investigative powers. The intention is that such improvements will assist in reducing the delays associated with the investigation and prosecution of complex crime, in particular white collar crime.‚ÄĚ
  • Japan: New legislative framework for Sukuk

    The new framework passed in May 2011 will provide a solid legal platform for issuing Sukuk Ijarah under Japanese law. NAOKI ISHIKAWA highlights key legal structures and tax treatment in respect of the anticipated Sukuk issuances in Japan.
  • Yakult Bottle Acquired Distinctiveness

    Do you know about Yakult's delicious lactic acid drink which is contained in a small bottle? Yakult's lactic acid drink (hereafter referred to as "Yakult drink") is the most famous lactic acid drink in Japan and today is also being sold in many countries around the world. When you are enjoying Yakult drink, please keep in mind the case mentioned below.
  • Tax: Japan: International Joint Ventures

    Tax on international joint ventures. Country Q&A (Japan).
  • Japan: Recent Developments in Practice and Law

    The successful closing of two Islamic fi nance transactions which was announced in July 2010 by Nomura Holdings have paved a concrete path for Japanese corporations to consider overseas Islamic fi nance markets for their fund raising activities. The fi rst transaction was in Asia for the issuance of Sukuk Ijarah and the second was in the Middle East for the establishment of a Commodity Murabahah facility (Nomura Deals).
  • Renewable energy takes off in Japan

    Like many other countries, Japan has decided to reform its renewable energy (RE) policy, to dramatically increase the use of renewable energy. The core policy mechanism is a feed-in tariff (FIT). This chapter summarises the contemplated Japanese FIT and its practical impact on existing and future investment in this sector, providing an overview of:
  • Licensing - 2010

    Q & A on Licensing in Japan 
  • Law on the Civil Jurisdiction of Japanese Courts over Foreign Countries, etc.

    The Law has been enacted to clarify the scope of application of the civil jurisdiction of Japanese courts over foreign countries, etc., and set exceptions to civil preocedings involving foreign countries, etc., based on the United Nations Convention on the Jurisdictional Immunities of States and their property (UN Convention on Immunities) (see Article 1).