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Nagashima Ohno & Tsunematsu

Work +81 3 6889 7000
Fax +81 3 6889 8000

Eriko Watanabe

Work +81 3 6889 7000
Nagashima Ohno & Tsunematsu

Work Department

Antitrust/Competition Law Practice (including Merger Control, Investigation and Litigation); Compliance and Audit; Risk and Crisis Management; General Corporate


Nagashima & Ohno (1988-1995); Kirkland & Ellis LLP, Chicago (1994-1995); The Fair Trade Commission of Japan (1995-1998); Nagashima Ohno & Tsunematsu (1988-); Professor (Antitrust Law and Corporate Law), Keio Law School (2004-2007); Member of the New Growth Policy Committee for the Ministry of Economy, Trade and Industry (2005-2007, 2009); Member of Supervisory Commission for Public-Private and Private-Private Competitive Tenderings for the Cabinet (2007-2012); Member of the Board of Governance and Supervisory Board, NHK (Japan Broadcasting Corporation) (March 2012-February 2015)


Japanese & English.


Tohoku University (LL.B.) (1983); University of Washington School of Law (LL.M.) (1994)

Japan: Antitrust and competition law

Independent local firms

Within: Independent local firms

The team at Nagashima Ohno & Tsunematsu, headed by Eriko Watanabe, is β€˜extremely knowledgeable’ and β€˜extraordinarily responsive, providing strong substantive and practical advice’. Antitrust work undertaken by the firm covers sectors such as energy, financial services, telecoms, manufacturing and pharmaceuticals. Kaoru Hattori is a β€˜real star’, the β€˜fantastic’ Yusuke Kaeriyama was promoted to partner, and Ryohei Tanaka is an associate to note.

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Japan: Risk management and investigations

Independent local firms

Within: Independent local firms

With a β€˜brilliant team capable of handling detailed investigations and legal analysis’, Nagashima Ohno & Tsunematsu provides β€˜a highly strategic, reliable and professional service’, which clients β€˜would recommend without hesitation’. Hideaki Kobayashi, Takayoshi Tao and Akihisa Shiozaki co-chair the practice, which is β€˜a leader in the field for corporate regulatory and compliance issues’, particularly those with a cross-border element. Highlights for the β€˜exceptional’ group included Shiozaki assisting Takata with its global strategy following multiple product defect claims against Takata airbags due to airbag ruptures and the subsequent product recall arrangement across the US, Asia and Europe. In other work, Kobayashi acted for Novartis Pharma in a regulatory and criminal investigation regarding alleged data manipulation issues surrounding academic research relating to its Diovan product. Eriko Watanabe is recommended for antitrust matters, Fumihide Sugimoto handles corporate governance and Takahiro Yamauchi is the key name for trade secret protection issues. Counsel Atsushi Iritani is also singled out for his β€˜thorough attention to detail’.

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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

    The Minister for Justice, Alan Shatter (β€œthe Minister”), has published the Criminal Justice Bill 2011 (β€œthe Bill”). The main purpose of the Bill is stated to be β€œβ€¦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: