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Atsumi & Sakai

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

Kunihiro Sumida

Work +81 (0)3 5501 2175
Atsumi & Sakai

Work Department

Litigation Insolvency PG, Corporate PG, International PG


Partner (Labor and Employment, International Trading and Legal Affairs, Intellectual Property Law, Litigation, Arbitration, M&A and General Corporate Legal Affairs)


Partner at Atsumi & Sakai (2013-present); Hayabusa Asuka Law Offices LLP (April 2009-December 2012); Sonderhoff & Einsel Law and Patent Office LLP (December 2003-March 2009); Dorsey & Whitney LLP (2001-2003); Doctor Sonderhoff Law Office LLP (2000-2001).


Japanese and English.


Tokyo Bar Association


Meiji University (LL.B., 1994); The Legal Training and Research Institute of the Supreme Court of Japan; University of Kent (LL.M., 2007).

Japan: Dispute resolution

Independent local firms

Within: Independent local firms

Tatsuya Fukui and Toyoki Emoto co-lead Atsumi & Sakai’s practice, which has ‘excellent diversity and a real commitment to the clients, providing trustworthy advice for a good price’. Recent headline matters include representing 62 non-Japanese institutional investors and pension funds in a claim for damages against Olympus following a high-profile securities fraud. Kunihiro Sumida is recommended for labour disputes, the ‘very reactive and highly energeticBonnie Dixon focuses on international work, and clients praise London-based Ryuichi Nozaki as ‘an ace lawyer, who is efficient and pleasant to deal with’.

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Japan: Intellectual property

Independent local firms

Within: Independent local firms

Atsumi & Sakai handles cross-border patent infringement cases spanning diverse sectors, including chemicals, manufacturing and technology. IT-related matters and the registration, protection, use and licensing of model utility, copyright, design and trade mark rights are further strengths of the team. Practice head Chie Kasahara is recommended along with Kunihiro Sumida, who is noted for disputes.

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Japan: Labour and employment

Independent local firms

Within: Leading individuals: bengoshi

Kunihiro Sumida - Atsumi & Sakai

Within: Independent local firms

Led by Kunihiro Sumida, Atsumi & Sakai’s practice advises the Japanese subsidiaries of foreign companies on a diverse range of matters, including issues arising out of cross-border transactions. The team handles dismissals through working on termination schemes and settling disputes via mediation. Sumida undertook disputes involving claims such as sexual harassment and pay increases. Hiroyuki Sanbe handles disciplinary actions and cases surrounding the treatment of foreign employees, among other matters. Bonnie Dixon is also recommended.

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Japan: TMT

Independent local firms

Within: Independent local firms

Atsumi & Sakai formed a fintech group as part of its brand new innovation business support team, which comprises attorneys from a series of practice areas, including IP/IT, data protection and cybersecurity. Practice head Chie Kasahara handled data protection, regulatory matters and IT-related work. Kunihiro Sumida was active in IP, technology and software mandates.

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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

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    The Minister for Justice, Alan Shatter (“the Minister”), has published the Criminal Justice Bill 2011 (“the Bill”). The main purpose of the Bill is stated to be “…to 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.”
  • 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

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  • 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).