LAWYER PROFILE

Tatsuo Yamashima

Asia-Pacific 2026

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Atsumi & Sakai
 Atsumi & Sakai

Ranked in 2 practice areas

Competition/Antitrust

Japan

12 years ranked

Employment: Bengoshi

Japan

1 year ranked

Chambers Review

Provided by Chambers

Chambers Asia & Pacific

Competition/Antitrust - Japan

Band 3
Individual Editorial
Tatsuo Yamashima is known for his expertise in handling cartel cases. He provides a full-service offering, with a focus on behavioural mandates.
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Employment: Bengoshi - Japan

Band 4
Individual Editorial

Tatsuo Yamashima is a co-head of the firm’s labour and employment team. He regularly deals with the Labour Standards Inspection Office on compliance matters and in responding to its inquiries. He also often appears before the Tokyo Labour Relations Commission, the Tokyo Labour Bureau and the Tokyo District Court on matters concerning unfair labour practices, employment status and harassment. He ably assists clients with employment-related company policies.

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Strengths

Provided by Chambers

  • We received very valuable advice from Yamashima Sensei, which is generally sensible and practical in guiding us through the ever-changing regulatory landscape in Japan.

    Competition/AntitrustChambers Asia & Pacific

  • Tatsuo is a very experienced antitrust lawyer in Japan. He is definitely the go-to person for complex antitrust matters in Japan.

    Competition/AntitrustChambers Asia & Pacific

  • With an overwhelming backbone, there is a sense of trust that he provides all kinds of services, especially in overseas matters.

    Competition/AntitrustChambers Asia & Pacific

  • We had an excellent experience with Tatsuo and enjoyed very much working with him.

    Employment: BengoshiChambers Asia & Pacific

  • Tatsuo Yamashima is an attorney with deep expertise in Japanese employment law, always reliable, consistently dependable and known for fast turnaround times.

    Employment: BengoshiChambers Asia & Pacific

  • He is very good, very prompt and gives crisp and good advice.

    Employment: BengoshiChambers Asia & Pacific

Ranked Individuals at Atsumi & Sakai (12)

Japan

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