JAPAN Law and Practice Contributed by: Tsuyoshi Ikeda, Takaaki Someya, Muneharu Yamamoto and Hiroaki Miyauchi, Ikeda & Someya
Ikeda & Someya was founded in Tokyo in October 2018 by two lawyers, Tsuyoshi Ikeda and Takaaki Someya, who previously worked at the Japan Fair Trade Commission and the Consumer Affairs Agency, respectively, and used this experience to develop a leading practice in advertising and marketing regula - tion (including complex matters under the Act against Unjustifiable Premiums and Misleading Representa -
tions). Ikeda & Someya also has 21 other lawyers, more than half of whom have experience at regula - tory agencies or in-house at major companies. Ikeda & Someya operates three offices in Japan, located in Tokyo and other major cities. The two founding part - ners’ comments have been cited in various newspa - pers, magazines and media, including the Nikkei.
Authors
Tsuyoshi Ikeda is a founding partner at Ikeda & Someya. He previously served as an investigator at the Japan Fair Trade Commission, where he participated in around 20 dawn raids, prepared the implementation of the
Muneharu Yamamoto gained extensive experience at a major international law firm in a wide range
of corporate legal matters, with a focus on representing domestic and foreign companies in litigation and disputes. He also gained familiarity with the US legal system while attending law school in the USA. Drawing on such experience, Muneharu provides practical advice tailored to business in the fields of advertising, marketing regulation and consumer protection law, with a particular emphasis on compliance with the Act against Unjustifiable Premiums and Misleading Representations.
leniency system, and investigated a case involving standard essential patents. In addition to antitrust and competition cases, Tsuyoshi has experience in advising on advertising regulation and the Act against Unjustifiable Premiums and Misleading Representations. He is noted for his success in the most cutting-edge cartel, merger review and antitrust/competition cases. Tsuyoshi is registered as an attorney in New York and California. Takaaki Someya is a founding partner at Ikeda & Someya. He has deep experience in consumer affairs from his work at the Consumer Affairs Agency (CAA), including drafting articles and guidelines for the revised Act against Unjustifiable Premiums and Misleading Representations. He has advised on CAA investigations, marketing legal strategies, and law amendments. Additionally, his role as in-house counsel at a major IT company and secondment to a fintech firm give him practical experience in technology businesses, including IT, gaming, fintech and data.
Hiroaki Miyauchi has experience in handling a broad range of legal matters, including antitrust law, the Subcontract Act, and advertising and consumer protection laws. At the Consumer Affairs Agency, he worked
on enforcement and policy issues, particularly relating to the Act on Specified Commercial Transactions. He also served as in-house counsel at the Japan Business Federation (Keidanren), where he contributed to various legal reforms and guideline development. Miyauchi provides practical, business- focused legal advice tailored to client needs.
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