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Education
  • University of Tokyo (B.S.,1986)
  • University of Tokyo (M.S.,1988)
  • University of Tokyo (LL.B.,1993)


Bar Admissions
Admitted only in
  • Japan

Kazuyasu Yoneyama Kazuyasu Yoneyama

Of Counsel
Primary Office: Tokyo

Email: kyoneyama@mofo.com
Phone: 81 3 3214 6522
Fax: 011-81-3-3214-6512

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Professional Summary



Kazuyasu Yoneyama is Of Counsel to Ito & Mitomi.

Mr.Yoneyama’s principal areas of practice are antitrust and intellectual property matters.

In addition to a range of domestic Japanese antitrust matters, he has represented clients in complex cross-border antitrust investigations. These include the defense of a Japan-based manufacturing group in an international cartel investigation brought by the European Commission, and representation of a global technology company in a Japan Fair Trade Commission investigation of its competitor and as the plaintiff in Japanese civil antitrust litigation.

He also has range of experience in intellectual property, product liability and other litigation matters. He brings to the IP practice his background as a physicist.

Mr. Yoneyama was involved in scientific research activities in elementary particle physics and field theory in Tokyo University and at the Graduate School of Science of Tokyo University until 1989. He then moved to Faculty of Law and received an LL.B. degree from Tokyo University in 1993.

He completed his studies at the Supreme Court Legal Training & Research Institute, and was admitted to practice law in Japan in 2003. He is a member of the Tokyo Bar Association.