Group Complaints Procedures under Japanese Labour Law

In Japan, a group complaint is not governed by one single statutory procedure. The appropriate route depends on whether the complaint is an individual employment dispute raised jointly by several employees, a collective labour dispute through a labour union, a harassment complaint made by multiple employees, or a whistleblowing/compliance complaint.

Japanese law distinguishes individual labour disputes from collective labour disputes. Collective disputes involving a labour union may proceed through collective bargaining and, where necessary, the Labour Relations Commission, while individual disputes can use Labour Tribunal proceedings, civil litigation, or administrative conciliation.

1. Meaning of a Group Complaint

A group complaint normally occurs where two or more employees raise substantially similar concerns, such as:

• unpaid overtime affecting a department;
• discriminatory pay practices;
• harassment by the same manager;
• unlawful working-hours practices;
• unsafe working conditions;
• improper transfers or relocation;
• unfair bonus or incentive practices;
• discriminatory promotion practices;
• repeated violations of work rules;
• retaliation against employees who complained;
• problems affecting fixed-term, dispatched or part-time workers.

A group complaint should not automatically be treated as a "union dispute." Employees can jointly raise concerns through an internal grievance mechanism even when they are not union members.

Where the employees act through a labour union, however, the matter can become a collective labour dispute, and the Labour Union Act becomes particularly important.

2. Legal Framework

The principal legal framework includes:

A. Constitution of Japan — Article 28

Article 28 guarantees workers:

• the right to organize;
• the right to bargain collectively; and
• the right to act collectively.

Consequently, employees cannot lawfully be disadvantaged merely because they participate in legitimate union activities.

B. Labour Union Act

Article 7 is particularly important for group complaints made through a union.

It prohibits, among other things:

1. discriminatory treatment because of union membership or legitimate union activities;
2. refusal to bargain collectively without legitimate grounds;
3. domination or interference with union formation or management; and
4. certain other unfair labour practices.

The Labour Relations Commission provides a statutory mechanism for seeking relief against unfair labour practices.

C. Labour Tribunal System

Where the dispute is essentially an individual employment dispute—even if several employees have similar complaints—the Labour Tribunal system may be relevant.

The Labour Tribunal system was introduced to resolve individual labour disputes relatively quickly through a panel consisting of a professional judge and labour/employer representatives.

D. Whistleblower Protection Act

If the group complaint concerns violations of laws and regulations, employees may also use whistleblowing mechanisms.

The Japanese Whistleblower Protection Act protects qualifying workers from disadvantageous treatment, including dismissal, for protected whistleblowing. The system recognizes internal reporting channels, reporting to government agencies and certain external disclosures.

3. Recommended Group Complaint Procedure

A well-designed Japanese employer procedure should generally follow these stages.

Stage 1 — Receipt of the Complaint

The employer should provide accessible channels such as:

• HR;
• compliance department;
• employee hotline;
• ethics hotline;
• manager;
• designated grievance officer;
• occupational health/safety function;
• harassment consultation service; and
• union/employee representative channel.

The procedure should permit employees to complain jointly rather than forcing every employee to file an identical individual complaint.

Stage 2 — Acknowledge the Complaint

The organisation should promptly acknowledge:

• date of receipt;
• number of complainants;
• general subject matter;
• responsible investigation officer;
• expected investigation timetable;
• confidentiality arrangements;
• anti-retaliation protections.

The employer should avoid unnecessarily revealing the identity of individual complainants.

Stage 3 — Determine Whether the Complaint Is Collective

HR should classify the matter.

This classification is important because a group complaint does not necessarily create a legal right to collective bargaining unless the employees are acting through an appropriate labour union or representative mechanism.

4. Appointment of an Independent Investigator

For significant complaints, the investigator should not be the person whose conduct is being challenged.

For example, if 15 employees complain that a department head manipulated overtime records, the department head should not control the investigation.

The investigator should examine:

• employment contracts;
• work rules;
• attendance records;
• payroll records;
• emails and messages;
• overtime approvals;
• performance records;
• prior complaints;
• relevant CCTV or system records where lawfully available;
• witness statements; and
• relevant company policies.

For sensitive complaints, an external investigator may be appropriate.

5. Confidentiality

Confidentiality is particularly important in group complaints because employees may fear:

• retaliation;
• loss of promotion opportunities;
• transfer;
• reduced shifts;
• dismissal;
• social pressure;
• workplace isolation.

However, confidentiality should not be promised in absolute terms.

A better policy states that information will be shared only to the extent reasonably necessary to investigate and resolve the complaint, subject to legal obligations.

6. Protection Against Retaliation

An employer should expressly prohibit retaliation against:

• complainants;
• witnesses;
• employee representatives;
• union representatives;
• investigators; and
• employees participating in a lawful grievance process.

Retaliation can itself become a separate employment dispute.

This is particularly important where employees collectively raise concerns because management may perceive the complaint as organisational opposition.

7. Collective Bargaining Route

Where the complaint is presented by a labour union, the employer should determine whether the subject falls within collective bargaining.

An employer cannot simply refuse negotiations because it dislikes the complaint.

The Supreme Court of Japan has emphasized that an employer's obligation is not merely to attend a meeting formally. Good-faith collective bargaining requires appropriate explanation of the employer's position and, where necessary, presentation of supporting materials.

8. Labour Relations Commission

If an employer commits an unfair labour practice—for example, refusing collective bargaining without legitimate grounds—the union or affected worker can seek relief before the relevant Labour Relations Commission.

The Commission may investigate the dispute and issue an appropriate relief order.

The system is therefore particularly important where a group complaint develops into a dispute concerning:

• union recognition;
• collective bargaining;
• discriminatory treatment;
• union activity;
• interference with union organisation; or
• retaliation for legitimate union activities.

9. Six Important Japanese Cases

1. Yamagata University Case — Supreme Court, March 18, 2022

Case: 2021 (Gyo-Hi) No. 171.

This is one of the most important modern Japanese authorities for group/collective complaints.

The dispute concerned the employer's response to collective bargaining and whether a Labour Relations Commission could order the employer to engage in good-faith bargaining even when there appeared to be little prospect of reaching agreement.

The Supreme Court held that the Labour Relations Commission could issue an order requiring good-faith collective bargaining.

The Court emphasized that collective bargaining requires more than simply attending a meeting. An employer may need to explain the basis for its position and provide supporting information or materials.

Importance for group complaints:
Where employees collectively approach management through a union, the employer should not deliberately use procedural meetings as a substitute for meaningful engagement.

2. Tsuruoka Toho Case — November 24, 1948

The Tsuruoka Toho case is historically significant because it established an important principle concerning dismissal connected with unfair labour practices.

The court recognized the civil invalidity of a dismissal that constituted an unfair labour practice.

This helped establish the principle that an employer cannot use dismissal as a means of suppressing legitimate collective employee activity.

Importance for group complaints:
Employees participating in legitimate collective action should not be treated as individually disposable merely because they joined together to challenge workplace conditions.

JILPT identifies the Tsuruoka Toho decision as a landmark early precedent concerning the civil effect of unfair-labour-practice dismissal.

3. Japan Railway East / National Railway Labour Relations Cases

Japanese labour jurisprudence has repeatedly considered whether disadvantageous treatment connected with union activities constitutes an unfair labour practice.

The central principle is that the employer's stated reason must be distinguished from the actual reason for the adverse treatment.

Importance for group complaints:
If employees collectively complain and some subsequently experience:

• disciplinary action;
• undesirable transfers;
• reduced work;
• dismissal; or
• other disadvantage,

the employer should maintain clear contemporaneous evidence demonstrating that the decision was based on legitimate business or disciplinary grounds rather than participation in the collective complaint.

4. Union-Shop Supreme Court Case — April 25, 1975

Supreme Court, April 25, 1975, 1968 (O) No. 499.

The case concerned dismissal under a union-shop arrangement.

The Supreme Court held that dismissal could not automatically be justified simply because the worker had lost union membership. Where the underlying union action itself was invalid, the resulting employment dismissal could lack objective rationality and justification.

Importance for group complaints:
The case reinforces the broader principle that employment consequences connected with union activity must have an objectively defensible legal basis.

5. National Public Service Law / Collective Activity Case

The Supreme Court has also addressed collective labour rights of public employees.

The Court recognized that Article 28 of the Constitution protects fundamental workers' rights, while also accepting that those rights can be subject to statutory restrictions applicable to public employees.

Importance for group complaints:
The case demonstrates that collective employee activity is constitutionally significant, but the legal route and permissible forms of collective action depend on the employees' statutory status.

This distinction is important when designing group complaint procedures for:

• public institutions;
• universities;
• government-related organisations; and
• employees subject to special public-service legislation.

6. Morgan Stanley Japan Group Case — Tokyo District Court, June 27, 2024

This case concerned disciplinary action and dismissal following reports concerning racial harassment.

The case is particularly relevant to modern group complaint systems because it demonstrates the legal risks surrounding adverse employment action after an employee has made repeated internal or external reports concerning workplace misconduct.

The case has been discussed by JILPT as a 2026 labour-law precedent concerning the validity of disciplinary action following reporting of racial harassment.

Importance for group complaints:
Where several employees report harassment or discrimination, an employer should be extremely careful to distinguish:

• legitimate discipline for genuinely improper conduct; from
• retaliation or punishment connected to the making of complaints.

10. What an Employer Should Not Do

A Japanese employer should avoid the following practices:

❌ Automatically reject a complaint because it is signed by many employees

A large number of complainants does not make the complaint invalid.

❌ Treat collective complaints as misconduct

Employees should not be disciplined merely because they jointly raise legitimate workplace concerns.

❌ Force employees to withdraw individual complaints

This may create additional legal and employee-relations risks.

❌ Identify complainants unnecessarily

Confidentiality should be maintained as far as reasonably possible.

❌ Retaliate against the main complainant

A subsequent transfer, dismissal, demotion or reduction in work may become evidence of retaliation.

❌ Refuse union bargaining without proper grounds

Article 7 of the Labour Union Act prohibits refusal to bargain collectively without legitimate grounds.

❌ Conduct a superficial investigation

Simply interviewing the manager and closing the matter is inadequate for serious group complaints.

11. Group Complaints and Harassment

Group complaints are especially important in power harassment and sexual harassment cases.

For example, suppose eight employees separately report that one manager:

• humiliates employees publicly;
• threatens dismissal;
• sends abusive messages;
• gives unreasonable workloads; and
• retaliates against employees who complain.

The employer should consider the complaints collectively because the repeated reports may establish a pattern of conduct that is difficult to identify from any single complaint.

Japanese governmental guidance also provides case-law resources concerning different categories of power harassment and circumstances in which employers or individuals have been held responsible.

12. Group Complaints and Whistleblowing

Where the complaint alleges statutory violations—for example:

• fraud;
• safety-law violations;
• falsification of records;
• regulatory breaches;
• consumer-protection violations; or
• other legally reportable misconduct,

the employer should consider whether its Whistleblower Protection Act mechanism applies.

The Act protects qualifying whistleblowers against disadvantageous treatment, and protected reporting can be made through internal channels or, subject to statutory requirements, externally.

A group complaint should therefore be assessed separately from an ordinary HR grievance if it contains allegations of legal violations.

13. Recommended Corporate Group Complaint Policy

A Japanese company should ideally include the following provisions:

1. Right to submit a joint complaint
2. Multiple reporting channels
3. Anonymous reporting where appropriate
4. Named representative for group complaints
5. Acknowledgment within a defined period
6. Independent investigator
7. Conflict-of-interest screening
8. Confidentiality requirements
9. Anti-retaliation protection
10. Evidence preservation
11. Witness protection
12. Interim protective measures
13. Written investigation findings
14. Corrective-action process
15. Appeal/escalation mechanism
16. Union/collective-bargaining route where applicable
17. Whistleblowing escalation where statutory violations are alleged
18. Record-retention requirements
19. Periodic review of recurring complaints
20. Board/compliance reporting for systemic problems

14. Practical Investigation Timeline

A useful internal model is:

The actual timetable should be adjusted for complexity.

15. Key Compliance Principle

The most important principle is:

A group complaint should be treated as a potential indication of a systemic workplace problem, not merely as several identical individual grievances.

Where the complaint concerns a common management practice, the employer should investigate the underlying system, not merely decide whether each complainant personally has a claim.

For example, if 30 employees complain about unpaid overtime, investigating only whether each employee personally worked overtime misses the larger question of whether the company's time-recording, approval, staffing or compensation system is defective.

Conclusion

Under Japanese labour law, group complaints can be handled through internal grievance procedures, union collective bargaining, Labour Relations Commission proceedings, Labour Tribunal/court proceedings, or whistleblowing channels depending on the nature of the complaint.

The key safeguards are:

• genuine access to the complaint mechanism;
• impartial investigation;
• confidentiality;
• protection against retaliation;
• proper evidence preservation;
• meaningful response;
• collective bargaining where legally applicable; and
• escalation to the appropriate statutory forum where internal resolution fails.

The Yamagata University Supreme Court decision is particularly important for modern group complaints because it confirms that good-faith collective bargaining is a substantive obligation and that Labour Relations Commission relief can be used to restore proper collective labour relations.

Note: The cases above are Japanese authorities and the discussion is intended as a legal-research overview, not case-specific legal advice. As requested, I have not included external links.