Internet IssuesPublished: 2026-03-24/Updated: 2026-09-224 min readLawyer-Reviewed

Japan's Personal Data Protection Law: Rules for Businesses and Penalties for Violations

Key Takeaways

  • ✓Applies to all businesses handling personal information regardless of size
  • ✓The 2022 amendments significantly strengthened individual rights
  • ✓Mandatory breach notification to authorities and affected individuals
  • ✓Corporate fines raised to a maximum of ¥100 million

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What Is the APPI?

Japan's Act on Protection of Personal Information (APPI) aims to protect individual rights while considering the usefulness of personal information (Article 1).

Enacted in 2003 and significantly amended in 2015, the April 2022 amendments further strengthened individual rights protection.

Key Definitions

Personal Information

Information about a living individual that can identify a specific person, such as name, date of birth, and address (Article 2(1)). Personal identification codes (My Number, biometric data) are also included.

Personal Data

Personal information that constitutes a personal information database (Article 16(3)). Typically, information managed in a computer-searchable format.

Sensitive Personal Information

Information requiring special care, such as race, beliefs, medical history, criminal records, and disabilities (Article 2(3)). Consent is mandatory for collection.

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Key Obligations for Businesses

Specify and Notify Purpose of Use

Businesses must specify the purpose of use as clearly as possible (Article 17) and notify or publicize it upon collection (Article 21).

Prohibition of Use Beyond Purpose

Personal information cannot be used beyond the specified purpose (Article 18). Use beyond scope requires individual consent.

Security Control Measures

Businesses must implement measures to prevent leakage, loss, and damage of personal data (Article 23).

Specific measures: - Organizational measures (appointing responsible persons, establishing rules) - Human measures (employee training, confidentiality agreements) - Physical measures (access control to facilities, secure document storage) - Technical measures (access controls, encryption, log management)

Restrictions on Third-Party Transfers

Transferring personal data to third parties generally requires individual consent (Article 27).

Exceptions: - Required by law - Necessary to protect life, body, or property - Outsourcing (within the original purpose of use) - Business succession

Cross-Border Transfers

Additional requirements apply when transferring personal data to a third party in a foreign country (Article 28). Information about the destination country's data protection system must be provided to the individual.

Key Points of the 2022 Amendments

Mandatory Breach Notification

Certain data breaches now require reporting to the Personal Information Protection Commission (PPC) and notification to affected individuals (Article 26).

Reportable cases: - Leakage of sensitive personal information - Leakage due to unauthorized access - Leakage with risk of financial damage - Leakage affecting more than 1,000 individuals

Strengthened Individual Rights

  • Expanded grounds for use cessation and deletion requests (Article 35)
  • Disclosure requests now cover digital data
  • Individuals can specify the disclosure format (e.g., electronic records)

Pseudonymized Information

A new category of "pseudonymized information" (Article 2(5)) allows relaxed obligations for internal analysis purposes when data is processed to prevent individual identification.

Increased Penalties

  • Unauthorized provision of personal data databases: up to 1 year imprisonment or ¥500,000 fine
  • Corporate fines: raised to maximum ¥100 million (previously ¥500,000)
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Handling Cookies and Web Browsing Data

Caution

While cookies and access logs may not constitute personal information on their own, they are regulated as personally referable information (Article 31). When providing personally referable information to a third party who will link it with personal data, consent is required.

Penalties for Violations

ViolationPenalty
Violating PPC ordersUp to 1 year imprisonment or ¥1 million fine
Providing database for wrongful profitUp to 1 year imprisonment or ¥500,000 fine
Corporate fine (order violation)Up to ¥100 million
Reporting obligation violationUp to ¥500,000 fine

Administrative Sanctions

The PPC takes the following graduated measures.

  1. 1

    Recommendation

    The PPC first issues a recommendation (Article 148).

  2. 2

    Order

    As the next stage, the PPC issues an order (Article 148(2)).

  3. 3

    Criminal prosecution

    Violating PPC orders is subject to up to 1 year imprisonment or a ¥1 million fine.

Reputational Risk

Beyond legal penalties, data breaches severely damage corporate credibility. Media coverage can lead to customer attrition and business losses far exceeding the fine amounts.

Summary

Important

The APPI applies to all businesses handling personal information regardless of size. With significantly strengthened penalties in the 2022 amendments and the new mandatory breach notification requirement, building a robust information management framework is more important than ever.

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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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