The Act was passed in 2004 after a run of food labelling and vehicle defect scandals that came to light through insiders, and took effect in April 2006. It protects a worker, and since 2022 officers and recent former employees, who reports a fact covered by the Act: a criminal offence or a breach punishable by fines under a long list of laws on consumer safety, the environment, fair competition, personal data and other areas. Protection depends on where the report goes. A report inside the company needs only to be in good faith. A report to a regulator, and especially to the media, must meet stricter conditions about the evidence and the reasons for going outside. A dismissal because of a protected report is void, and other unfavourable treatment is banned.
The 2020 amendments, in force from 1 June 2022, changed the employer's side. Employers with more than 300 employees must set up a system to receive and investigate internal reports and designate the staff who handle them. Those staff are bound by confidentiality, and leaking a whistleblower's identity is punishable by a fine of up to 300,000 yen. Smaller employers have an effort duty.
Amendments passed in June 2025 go further from 1 December 2026. Dismissing or disciplining someone because they blew the whistle becomes a crime, punishable by up to six months' detention or a fine of up to 300,000 yen for the individual and up to 30 million yen for the company. A dismissal or disciplinary action within a year of the report is presumed to be retaliation, so the employer must prove otherwise. Protection extends to freelancers, and seeking to identify a whistleblower without good reason is prohibited.
What it means for a foreign employer
- Map the global hotline to Japanese law. A group ethics line run from overseas can satisfy the duty, but only if it covers Japanese reports, keeps the handlers' confidentiality duty and is made known to staff in Japanese.
- The burden of proof is shifting. From December 2026, any dismissal or disciplinary sanction within a year of a report needs strong independent documentation.
- Hunting for the source is now a breach. Regional leaders who respond to an anonymous report by asking who sent it are exposing the company.
- Senior compliance hires need this law. Japanese legal and compliance candidates should be able to explain the 2026 changes in an interview.
Sources
- Whistleblower Protection Act (Act No. 122 of 2004), as amended in 2020 (in force 1 June 2022) and by Act No. 62 of 2025 (promulgated 11 June 2025, in force 1 December 2026).
- Consumer Affairs Agency, guidelines for employers on measures under the Whistleblower Protection Act.