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Atsumi & Sakai

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

Chie Kasahara

Work +81-(0)3-5501-2438
Atsumi & Sakai

Work Department

Finance, Corporate, International Practice


Partner (Intellectual Property Rights, Entertainment Law, Cross-Boarder Transactions, General Corporate Legal Affairs, TMT (Technology, Media and Telecommunications) and Finance (PFI)).


Hayabusa Kokusai Law Offices (2000 – 2006); Greenberg Traurig LLP (New York) (2006 – 2007); Partner, Hayabusa Asuka Law Offices (2007 – 2008).


Japanese and English.


Dai-ichi Tokyo Bar Association, IP Lawyers’ Network Japan, a director of  Entertainment Lawyers' Network Japan, Global Advertising Lawyers Alliance  (GALA), Lifesciences Asia-Pacific Network (LAN), Corporate Law Study Group of the Dai-ichi Tokyo Bar Association, Association Littéraire et Artistique Internationale, Director of Entertainment Lawyers Network Japan


Hokkaido University (LL.B., 1993); Hokkaido University, School of Law (LL.M., 1996); Legal Training and Research Institute of the Supreme Court of Japan.

Japan: Intellectual property

Independent local firms

Within: Independent local firms

Atsumi & Sakai advises Japanese and multinational companies on trade mark registrations, license agreements, protection of IP rights and patent infringements. The practice is headed by Chie Kasahara.

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Japan: TMT

Independent local firms

Within: Leading individuals: bengoshi

Chie Kasahara - Atsumi & Sakai

Within: Independent local firms

Atsumi & Sakai excels in assisting multinational corporations, knowhow providers and international law firms on data protection, privacy and social media matters in Japan. The client base includes IT vendors, financial institutions, fintech companies and network companies across key sectors such as electronics, telecoms, media, healthcare, pharmaceuticals and software and computer services. Practice head Chie Kasahara has extensive experience in patent and regulatory/compliance matters; his team includes Takafumi Ochiai, who was promoted to partner, and Hiroyuki Sanbe. The firm also has a dedicated innovation practice group, which is split into fintech and internet of things (IoT)/artificial intelligence (AI) sub-teams, advising on matters arising from fast technological development.

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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 (“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

    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).