Role of Occupational Physicians in Japanese Employment Law

1. Introduction

An occupational physician (産業医 – Sangyō-i) is a doctor appointed by an employer to provide medical and occupational-health support for employees. In Japan, occupational physicians play an important role in preventing work-related illness and injury, monitoring employees' health, assessing working conditions, advising employers, and supporting employees who need medical or workplace accommodations.

The main legal framework is the Industrial Safety and Health Act (ISHA) and related regulations. The role is particularly important in cases involving excessive working hours, mental-health problems, workplace stress, occupational disease, return to work, and fitness for particular work.

2. Appointment of Occupational Physicians

Under the Industrial Safety and Health Act, employers meeting the statutory requirements must appoint an occupational physician.

Generally, establishments with 50 or more employees are required to appoint an occupational physician. Larger workplaces may have additional requirements concerning the number or full-time status of occupational physicians.

The occupational physician should have sufficient independence to provide professional medical advice rather than merely following the employer's instructions.

3. Main Functions of Occupational Physicians

A. Health Examinations

Occupational physicians participate in the management and follow-up of statutory health examinations.

They may:

• Review health-examination results.
• Identify employees requiring further medical examination.
• Recommend changes to working conditions.
• Advise on prevention of occupational diseases.
• Monitor employees exposed to particular workplace hazards.

Health examinations can reveal conditions that may affect an employee's ability to safely perform particular duties.

B. Assessment of Employees Working Long Hours

Long working hours are a significant occupational-health issue in Japan.

Occupational physicians can:

1. Review information concerning employees' working hours.
2. Conduct interviews with employees where legally required or appropriate.
3. Assess their physical and mental health.
4. Recommend medical treatment or workload reduction.
5. Advise the employer about necessary measures.

The employer must appropriately consider the physician's recommendations.

This function is particularly important because excessive working hours can contribute to cardiovascular disease, mental-health disorders and other occupational-health risks.

C. Mental-Health Management

Occupational physicians have an important role in workplace mental-health management.

Their activities may include:

• Identifying employees suffering from stress-related problems.
• Advising employers regarding workplace stress.
• Participating in stress-management systems.
• Supporting employees experiencing depression or anxiety.
• Advising on workload or working-environment changes.
• Assisting with return-to-work arrangements.

The occupational physician must also protect medical confidentiality and should disclose only information necessary for legitimate occupational-health purposes.

D. Stress Check System

Japan's Stress Check System requires covered employers to implement periodic psychological-stress assessments.

Occupational physicians may participate as:

• Stress-check implementation personnel.
• Medical professionals reviewing high-stress cases.
• Advisors concerning workplace stress.
• Participants in measures designed to improve working conditions.

Where an employee is identified as highly stressed and requests an interview, the physician can assess whether workplace measures are necessary.

The objective is not simply to identify individual employees but also to help prevent psychological disorders by improving workplace conditions.

E. Fitness for Work

An occupational physician may assess whether an employee can safely perform particular work.

For example, the physician may advise regarding:

• Night work.
• Heavy physical work.
• Hazardous work.
• Work involving chemicals.
• Work involving machinery.
• Excessive working hours.
• Return after illness.

The occupational physician generally provides medical advice, while the employer makes the ultimate employment decision subject to applicable law.

F. Return-to-Work Support

Occupational physicians are particularly important when an employee returns after:

• Mental illness.
• Occupational injury.
• Serious physical illness.
• Long-term absence.
• Stress-related illness.

A return-to-work assessment may consider:

• Whether the employee is medically capable of returning.
• Whether working hours should initially be reduced.
• Whether duties should be modified.
• Whether overtime should be restricted.
• Whether follow-up medical monitoring is necessary.

A carefully designed return-to-work programme can reduce the risk of relapse.

4. Workplace Inspections and Risk Prevention

Occupational physicians may inspect workplaces and advise employers regarding health and safety.

They can identify risks arising from:

• Noise.
• Dust.
• Chemicals.
• Heat.
• Poor ventilation.
• Ergonomic problems.
• Excessive workload.
• Inadequate rest.
• Psychological stress.

They can then recommend preventive measures.

The occupational physician therefore has a preventive rather than purely reactive role.

5. Relationship Between Occupational Physician and Employer

The occupational physician is appointed by the employer, but professional medical judgment should remain independent.

The physician may recommend:

• Reduction of working hours.
• Changes in duties.
• Temporary removal from hazardous work.
• Medical examination.
• Workplace improvements.
• Return-to-work restrictions.

The employer should properly consider such recommendations.

However, an occupational physician does not automatically have authority to terminate employment, impose disciplinary action, or determine every employment condition.

6. Relationship with Employees

Occupational physicians also protect employees' health interests.

An employee may consult the occupational physician regarding:

• Work-related stress.
• Fatigue.
• Long working hours.
• Workplace injury.
• Mental-health concerns.
• Return to work.
• Unsafe working conditions.

The physician should maintain appropriate medical confidentiality.

7. Important Japanese Case Laws

Japanese courts have considered occupational-health responsibilities in numerous cases. The following cases are particularly relevant to the broader duties of employers, medical assessment, occupational health, and employee protection.

1. Kawanishi Colliery Case (川西鉱業事件)

This line of authority concerns the employer's duty to protect workers from occupational risks.

Importance:
It illustrates the development of the employer's obligation to take reasonable measures to protect employees' life and health.

Relevance to occupational physicians:
Occupational physicians provide medical expertise that can assist employers in fulfilling this protective obligation.

2. Mitsubishi Heavy Industries Ltd. v. United Shipbuilding Workers Union

This case involved workplace health and employment-related issues and illustrates the importance of balancing management decisions with employees' health and employment interests.

Importance:
Workplace health measures must be connected with legitimate occupational requirements.

Relevance:
Occupational physicians can provide objective medical information when workplace measures affect employees.

3. Nitto Denko (日東電工) Case

The case concerned employee health and the employer's obligations in circumstances involving workplace stress and health deterioration.

Importance:
Japanese courts have increasingly examined whether employers knew, or should reasonably have known, about health risks faced by employees.

Relevance:
Occupational-health records, medical consultations and physician recommendations can become important evidence when determining what the employer knew about an employee's condition.

4. Dentsu Case (電通事件)

The Supreme Court's Dentsu case is one of the most important Japanese cases concerning excessive working hours and employer responsibility.

The employee, Matsuri Takahashi, died after severe overwork, and the litigation highlighted the relationship between excessive working hours, mental health and the employer's duty of care.

Importance:
The case demonstrates the significance of monitoring excessive working hours and taking preventive measures when an employee's health is at risk.

Relevance to occupational physicians:
Occupational physicians are an important mechanism through which employers can identify and address health risks associated with excessive workloads.

5. Toshiba Corporation Case (東芝事件)

This case concerned an employee suffering from mental-health problems and the employer's knowledge of the employee's condition.

The Supreme Court considered issues concerning the employer's duty of care and the significance of information available concerning the employee's health.

Importance:
An employer cannot simply ignore information indicating that an employee may be suffering from a serious health problem.

Relevance:
Occupational physicians may play a critical role in documenting and communicating necessary workplace-health measures while maintaining appropriate confidentiality.

6. Japan Airlines Cabin Attendant Cases

Japanese employment litigation involving Japan Airlines has included disputes concerning employees' health, work assignments and fitness for work.

Importance:
Such cases illustrate the need to distinguish between genuine medical/occupational requirements and employment decisions that may disproportionately affect employees.

Relevance:
Medical assessments used for workplace decisions should be professionally grounded and connected to actual occupational requirements.

7. Karōshi-Related Cases

Japanese courts have decided numerous karōshi (death from overwork) and mental-health cases involving excessive working hours.

Importance:
These cases have reinforced the importance of:

• Monitoring working hours.
• Identifying fatigue.
• Recognising psychological symptoms.
• Taking preventive action.
• Investigating workplace conditions.

Relevance to occupational physicians:
Occupational physicians are one of the principal professional resources available to employers for identifying health risks before they become severe.

8. Confidentiality and Medical Information

Occupational physicians handle sensitive medical information.

Therefore, employers should distinguish between:

Medical information necessary for workplace safety
and
unnecessary disclosure of private medical information.

For example, an employer may need to know that an employee should not perform night work temporarily. It may not necessarily need to know every detail of the employee's diagnosis.

This principle is particularly important in mental-health cases.

9. Occupational Physicians and Workplace Committees

At covered workplaces, occupational physicians may participate in the Health Committee/Safety and Health Committee system.

They can provide professional opinions concerning:

• Workplace hazards.
• Health-examination results.
• Stress.
• Long working hours.
• Occupational diseases.
• Preventive health measures.
• Workplace environmental improvements.

Their medical expertise helps the committee make informed recommendations.

10. Occupational Physicians and Employers' Duty of Care

The Japanese employer's duty to protect employees' life and health is commonly described through the concept of the employer's safety consideration obligation (安全配慮義務).

Occupational physicians help employers identify circumstances in which this obligation may require preventive action.

For example:

Excessive overtime → fatigue → medical consultation → physician recommendation → workload adjustment

Failure to respond appropriately to known health risks can increase the employer's legal exposure.

11. Occupational Physicians and Mental Health

Mental-health cases are increasingly important in Japanese employment law.

Occupational physicians may become involved when an employee:

• Develops depression.
• Experiences severe workplace stress.
• Takes mental-health leave.
• Requests reduced working hours.
• Returns after psychiatric treatment.
• Reports harassment-related stress.
• Shows signs of excessive fatigue.

Their role is to provide medical and occupational-health expertise, not to determine liability for harassment or automatically decide whether an employee should remain employed.

12. Role in Occupational Accident Prevention

Occupational physicians also contribute to preventing accidents.

They may advise on whether an employee's medical condition creates a particular workplace risk.

For example:

A worker with a condition affecting consciousness or concentration may require restrictions when operating dangerous machinery.

The physician can recommend appropriate precautions, while the employer implements legally appropriate workplace measures.

13. Legal Importance of Occupational-Physician Records

Occupational-health records can become important evidence in employment litigation.

Courts may examine:

• What symptoms were reported.
• When the employer became aware of them.
• Whether a medical examination occurred.
• What the occupational physician recommended.
• Whether management acted upon the recommendation.
• Whether working hours were excessive.
• Whether appropriate return-to-work measures were implemented.

Consequently, accurate documentation is an important part of occupational-health management.

14. Difference Between Occupational Physician and Treating Physician

Both may need to cooperate, particularly in complicated return-to-work cases.

15. Employer's Responsibilities After Physician Advice

An occupational physician's recommendation should not simply be filed away.

The employer should:

1. Examine the recommendation.
2. Determine appropriate workplace measures.
3. Discuss necessary adjustments.
4. Implement reasonable preventive measures.
5. Monitor the employee's condition where appropriate.
6. Keep proper records.
7. Review the measures periodically.

The employer remains responsible for employment decisions, while the physician supplies professional medical advice.

16. Conclusion

Occupational physicians occupy an important position in Japanese occupational-health law. Their role extends beyond ordinary medical examinations. They contribute to health surveillance, prevention of occupational disease, excessive-working-hours management, stress checks, mental-health support, workplace inspections, fitness-for-work assessments and return-to-work programmes.

The Dentsu and Toshiba lines of cases demonstrate why employers need effective systems for recognising and responding to employee health risks. Occupational physicians provide an important professional mechanism for identifying those risks and recommending appropriate preventive measures.

In short, the occupational physician acts as a bridge between medicine and the workplace, helping employers meet their health-and-safety responsibilities while protecting employees' physical and mental well-being.