Secondment (Shukko) vs. Worker Dispatch (Haken) under Japanese Labour Law

In Japanese employment law, shukko (出向) and haken (労働者派遣) can look similar because in both arrangements an employee performs work for another company. The decisive issue, however, is the legal relationship between the worker and the receiving company.

The Ministry of Health, Labour and Welfare (MHLW) expressly distinguishes the two: in secondment, the receiving company generally has an employment relationship with the worker; in dispatch, the worker remains employed by the dispatching company and the receiving company ordinarily has only the statutory right of direction and supervision.

1. Meaning of Shukko (出向)

Shukko means secondment.

The most common form is zaiseiki-gata shukko (在籍型出向) — "secondment while retaining one's position with the original employer."

The worker:

• remains an employee of the original employer;
• works for the receiving company;
• generally enters into an employment relationship with the receiving company;
• becomes subject to the receiving company's directions as an employer;
• may become subject to the receiving company's work rules and employment conditions to the extent agreed;
• normally has a continuing employment relationship with the original company as well.

The MHLW describes this as a situation where the worker has employment relationships with both the sending and receiving companies, unlike ordinary worker dispatch.

There is also transfer-type secondment (ishoku-gata shukko / 移籍型出向), where the employment relationship with the original employer ends and the worker becomes employed by the new company.

2. Meaning of Worker Dispatch (Haken)

Under the Worker Dispatching Act, worker dispatch involves:

an employer having its employee work for another person under that person's direction and supervision, without creating an employment relationship between the worker and the receiving company.

Thus:

Dispatching company → employment contract → worker

and

Receiving company → direction/supervision → worker

The MHLW expressly describes this three-party structure.

The receiving company therefore does not ordinarily become the worker's employer merely because it gives day-to-day instructions.

3. Core distinction

The MHLW specifically states that the name assigned by the companies is not decisive. The actual relationship between the parties must be examined.

4. The most important test: employment relationship

The central question is:

Does the receiving company merely exercise delegated direction and supervision, or does it actually employ the worker?

For a genuine zaiseiki shukko, the receiving company and worker have an employment relationship.

The MHLW identifies factors relevant to determining whether that relationship exists, including:

• whether the receiving company pays all or part of wages;
• whether its work rules apply;
• whether it independently changes the worker's working conditions;
• whether the receiving company has social/labour insurance responsibilities;
• whether the receiving company possesses the employer's authority over the worker; and
• the overall substance of the relationship. 

No single factor necessarily decides the issue.

5. Direction and supervision is not enough by itself

This is one of the most important practical distinctions.

In haken, the receiving company is specifically permitted to direct and supervise the worker within the statutory dispatch relationship.

In shukko, the receiving company exercises authority because it has an employment relationship with the worker.

Therefore:

Same physical workplace + same manager + same daily instructions ≠ automatically the same legal arrangement.

The legal source of the receiving company's authority is different.

6. Why the distinction matters

Classification affects:

A. Licensing

Ordinary worker dispatch is a regulated business under the Worker Dispatching Act.

If an arrangement described as "secondment" is actually merely supplying employees to another company for that company's direction, authorities can examine whether it is actually worker dispatch or prohibited worker supply.

B. Labour-law responsibility

In a genuine secondment, responsibility can be divided between the two employers according to their respective employment relationships and the secondment agreement.

The MHLW explains that both the sending and receiving employers can have Labour Standards Act responsibilities to the extent their respective employment relationships exist.

C. Working hours

The parties should clearly specify responsibility for:

• working-hour management;
• overtime;
• holidays;
• leave;
• health and safety;
• wage payments;
• workplace rules; and
• accident reporting.

D. Employee consent

A secondment changes the employer's exercise of authority and can materially affect working conditions. Japanese case law therefore pays particular attention to whether the employment contract, work rules or collective agreement provides a sufficiently clear basis for the secondment.

7. Case Law

Case 1 — Supreme Court, 19 October 1973

Supreme Court, Second Petty Bench, 19 October 1973

This is a foundational Japanese case concerning zaiseiki shukko.

The Supreme Court recognized secondment as a situation in which an employee retains employee status with the original company while working under the direction of the receiving company. The case emphasized that secondment changes the holder of the right to direct the employee and therefore is legally significant.

The Court indicated that, absent an appropriate contractual or collective-agreement basis, an employer cannot simply assume an unrestricted power to order secondment.

Principle

A secondment order requires a clear legal basis.

That basis can arise through:

• the employment contract;
• work rules;
• a collective agreement; or
• other circumstances establishing the employee's obligation to accept secondment.

Importance

This case helps distinguish shukko from ordinary dispatch: secondment is not merely a commercial supply of labour; it involves a significant alteration in the employment relationship.

8. Case 2 — New Japan Steel Corporation Case

Supreme Court, Second Petty Bench, 18 April 2003

Shin-Nippon Seitetsu / New Japan Steel Corporation Case

This is one of the most important cases concerning zaiseiki shukko.

Employees objected to being seconded to a cooperating company in connection with outsourcing of an internal transportation operation.

The Supreme Court examined:

• the company's work rules;
• collective agreements;
• the secondment arrangements;
• treatment of employees during secondment;
• duration;
• wages;
• retirement benefits;
• allowances;
• promotion and salary assessments; and
• the employees' overall protection.

The Court accepted the validity of the secondment orders because there was a sufficiently clear and reasonable contractual/collective basis for secondment.

Principle

An employer does not necessarily need individual consent every time it orders secondment.

But there must be an adequate contractual foundation and the order must remain within the permissible scope.

Relevance to shukko vs haken

The case illustrates that genuine secondment involves an established legal relationship between the original employer, receiving employer and employee—not merely sending an employee to another business to work under its instructions.

9. Case 3 — Hitachi Manufacturing / Secondment Case, Supreme Court, 14 July 1986

Supreme Court, Second Petty Bench, 14 July 1986

This case is significant for the broader principle governing employer-ordered personnel transfers.

The Supreme Court held that an employer's authority to order transfers is not unlimited and can constitute an abuse where the order lacks a proper basis or is exercised improperly. Japanese labour authorities cite this decision in explaining the limits on employer transfer powers.

Principle

Even where an employer possesses a contractual transfer power, its exercise may be challenged where it constitutes an abuse of rights.

Application to shukko

A company cannot avoid scrutiny simply by putting "secondment" into its work rules. The purpose, circumstances and consequences of the actual order remain relevant.

10. Case 4 — Osaka District Court, 31 May 2000

Osaka District Court, 31 May 2000
Case Nos. Heisei 10 (Wa) Nos. 11109 and 11221

This litigation concerned arrangements involving worker supply and employment relationships.

The court examined the actual relationship between workers, the supplying organization and the workplaces rather than relying merely upon terminology.

The case illustrates the importance of distinguishing:

• employment;
• worker supply;
• secondment; and
• other labour-supply arrangements.

The court found that the relevant organization primarily arranged work opportunities and that the actual employment relationship was formed between the workers and individual workplaces.

Principle

The substance of the relationship is critical in determining whether a worker-supply arrangement exists.

Relevance

A company cannot automatically transform a labour-supply arrangement into lawful shukko merely by describing it as "secondment."

11. Case 5 — Supreme Court, 1973: Definition of Secondment

The Supreme Court's 19 October 1973 judgment has particular significance because Japanese government materials subsequently relied upon it when explaining the concept of shukko.

The Japanese government described the case as recognizing shukko as an employment arrangement where the employee retains status with the original company while working for another company, accompanied by a change in the holder of the right of direction and supervision.

Principle

The defining characteristic of genuine secondment is therefore not merely:

"The employee works somewhere else."

Rather, the legal arrangement involves a restructuring of the employment relationship and authority over the employee.

12. Case 6 — 14 January 2016 judgment concerning abusive secondment

Judgment dated 14 January 2016

In this case, a court examined a secondment order issued alongside disciplinary treatment.

The court concluded that the secondment was effectively being used for a disciplinary purpose, and considered the motivation and purpose of the order improper. It therefore treated the secondment order as an abuse of the employer's authority.

Principle

Even when a valid secondment mechanism exists, it cannot necessarily be used as a disguised disciplinary sanction.

HR significance

Employers should distinguish:

legitimate personnel secondment

from

secondment imposed primarily to punish an employee.

13. Case 7 — Panasonic PDP Case, Supreme Court, 18 December 2009

The Panasonic PDP case is particularly useful when analysing the boundary between dispatch, contracting and direct employment.

The Supreme Court examined whether a direct employment relationship had arisen between workers and the company receiving their labour. The Court emphasized that the existence of an employment relationship must be assessed by considering the totality of the circumstances, including who determined wages and who controlled the workers' actual working arrangements.

The case is frequently relevant to questions surrounding disguised labour arrangements.

Relevance to shukko

The case should not be mechanically applied to genuine secondment, because genuine shukko contains an employment relationship with the receiving company. Nevertheless, it demonstrates the broader Japanese judicial approach:

The actual substance of the labour relationship is more important than the label placed on the contract.

14. Shukko vs Haken: Three-party relationship

Genuine zaiseiki shukko

Company A
↓ employment relationship
Employee
↓ employment relationship
Company B

There is also a secondment agreement between A and B.

The worker therefore has employment relationships with both companies.

Worker dispatch

Dispatch Company A
↓ employment relationship
Employee
↓ direction/supervision
Company B

There is no ordinary employment relationship between B and the worker.

Instead, A and B have a worker-dispatch contract. This structure is expressly described by the MHLW.

15. Shukko can create worker-supply issues

This is an important compliance point.

The MHLW explains that zaiseiki shukko can technically fall within the concept of worker supply, but ordinary secondments undertaken for legitimate purposes—such as securing employment opportunities or employee training—are generally treated differently from a business conducted as worker supply.

Therefore, companies should be particularly careful where:

• employees are repeatedly supplied to unrelated businesses;
• the receiving company exercises virtually all employer functions;
• the arrangement is commercial and recurring;
• the sending company retains little genuine employment function;
• there is no legitimate personnel-management purpose; or
• the arrangement resembles labour brokerage.

16. Practical classification test

Before calling an arrangement shukko, HR should ask:

Step 1 — Does the receiving company employ the worker?

If yes, this strongly supports genuine secondment.

If no, consider whether the arrangement is worker dispatch.

Step 2 — Who determines employment conditions?

Examine who controls:

• wages;
• working hours;
• holidays;
• evaluation;
• discipline;
• promotion;
• leave; and
• termination-related matters.

Step 3 — Who has employer authority?

Is Company B exercising authority because it is an employer, or merely because Company A has legally delegated day-to-day direction under the Worker Dispatching Act?

Step 4 — What does the documentation say?

Check:

• employment contract;
• work rules;
• collective agreement;
• secondment agreement;
• dispatch agreement;
• wage arrangements; and
• insurance arrangements.

Step 5 — What actually happens?

This is critical.

If the paperwork says shukko but the reality resembles haken, the authorities/courts can examine the actual relationship rather than accepting the contractual label.

17. Example

Example A — Genuine shukko

Company A transfers an employee to its group company B for three years.

During the period:

• employee remains an employee of A;
• B employs the employee under a secondment employment relationship;
• B applies its workplace rules;
• B determines day-to-day employment conditions;
• A and B have a detailed secondment agreement;
• employee's salary and benefits are allocated between the companies;
• employee returns to A after the secondment.

This is characteristic of zaiseiki shukko.

Example B — Haken

Company A employs 100 workers and sends them to Company B.

B:

• selects the individual workers;
• directly assigns daily tasks;
• determines working schedules;
• supervises their work;
• controls the workplace;
• but has no employment contract with them.

That is characteristic of worker dispatch, subject to the Worker Dispatching Act.

Example C — Mislabelled arrangement

Company A calls an arrangement "secondment," but:

• B does not actually employ the workers;
• A performs little genuine employer function;
• B simply receives workers for labour;
• the arrangement is repeatedly conducted as a commercial business.

The arrangement requires careful legal analysis because the label "shukko" does not by itself determine its legal character.

18. Key legal consequences of misclassification

Misclassifying haken as shukko can expose companies to:

1. Worker Dispatching Act violations
2. Problems concerning authorization/notification requirements
3. Illegal worker-supply issues under the Employment Security Act
4. Labour Standards Act compliance problems
5. Wage and overtime disputes
6. Employer-liability disputes
7. Social-insurance issues
8. Health-and-safety responsibility disputes
9. Potential direct-employment arguments
10. Regulatory and reputational consequences

The MHLW specifically warns that classification must be based on the actual substance rather than the name of the arrangement.

Conclusion

The simplest way to remember the distinction is:

Shukko = the worker is seconded into an employment relationship with the receiving company while generally retaining employment status with the original company.

Haken = the worker remains employed by the dispatching company, while the receiving company receives the worker's labour and exercises statutory direction and supervision.

The distinction is therefore principally about the legal source of the receiving company's authority and whether an employment relationship exists between the worker and receiving company.

The major Japanese cases—including the 19 October 1973 Supreme Court decision, New Japan Steel (18 April 2003), the 14 July 1986 Supreme Court decision, the 31 May 2000 Osaka District Court cases, the 14 January 2016 judgment, and Panasonic PDP (18 December 2009)—illustrate different aspects of the same fundamental approach: courts look at the real employment relationship, contractual foundation, purpose and substance of the arrangement, rather than relying solely on terminology.