Internet Issues- View allLast updated: 2026-03-13

Online Defamation: How to File a Sender Disclosure Request in Japan

Key Takeaways

  • Anonymous online defamers can be legally identified
  • The 2022 reform shortened the process to about 6-12 months
  • Typical damages range from ¥300,000 to ¥1,000,000 for individuals
  • ISP logs are deleted within 3-6 months, so act quickly

What is Online Defamation?

Posts on social media, forums, and review sites that lower an individual's or company's social reputation may constitute defamation (Criminal Code Art. 230) or insult (Art. 231) under Japanese law.

Sender Disclosure Request Overview

The sender disclosure request (Provider Liability Limitation Act Art. 5) is the legal procedure to identify anonymous posters.

2022 Reform

The October 2022 reform streamlined the process from two stages to a single court proceeding, reducing the timeline from 1-2 years to approximately 6 months to 1 year.

Typical Damages Awarded

  • Individual defamation: ¥300K-1M
  • Corporate reputation damage: ¥500K-3M
  • Sexual content: ¥1M-2M

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This article provides general legal information and does not constitute legal advice. For specific legal issues, please consult with a qualified attorney.

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