労働契約法第19条
Restrictions on Refusing to Renew Fixed-Term Employment Contracts (Non-Renewal Doctrine)
有期労働契約の更新等（雇止め法理）
Plain-language explanation
This article codifies what is known in Japan as the "non-renewal (雇止め) doctrine." Even though a worker is on a fixed-term contract (e.g., a contract employee, part-timer, or temporary staff), the employer's ability to simply let the contract lapse without renewing it is restricted in two situations: (1) the contract has been repeatedly renewed so many times that ending it functions, in practice, just like dismissing a permanent employee, or (2) the employee has a reasonable basis for expecting the contract to be renewed again (for example, based on past practice or statements from management).
If either situation applies, and the employee applies to renew the contract before it expires (or applies for a new contract promptly after expiration), the employer cannot refuse that application unless it has an "objectively reasonable reason" that is "socially acceptable." If the refusal fails to meet that standard, the law deems the employer to have accepted the renewal on the same terms as the previous contract — meaning the contract is treated as automatically continuing.
In practice, this provision protects workers who have been on a series of short-term contracts renewed many times over the years, or who were led to believe (explicitly or implicitly) that their contract would continue. For business owners, this means that before deciding not to renew a fixed-term contract, you must carefully evaluate the renewal history, length of service, how renewal has been handled administratively, and any assurances given to the employee — because an unjustified non-renewal can be legally treated as if you agreed to renew the contract.
日本語での解説
この条文は、いわゆる「雇止め法理」を法律に明文化したものです。有期労働契約（契約社員、パート、契約期間が決まっているアルバイトなど）であっても、①これまで何度も更新を繰り返しており、実質的に正社員の解雇と同じように評価できる場合、または②労働者が「次も更新されるだろう」と期待することに合理的な理由がある場合には、契約期間満了時に会社側が一方的に更新を拒否（雇止め）することが制限されます。
具体的には、労働者が契約期間満了までに更新を申し込んだ場合、または満了後すぐに新たな契約締結を申し込んだ場合、会社がその申込みを拒絶することに「客観的に合理的な理由」がなく、「社会通念上相当」と認められないときは、法律上、従来と同じ労働条件で会社が承諾したものとみなされます。つまり、正当な理由のない雇止めは無効となり、契約は自動的に更新されたことになります。
この条文は、長期間にわたり形式的な更新を繰り返してきた契約社員や、上司から「次も頑張ってね」等の発言を受けていた労働者を保護するために使われます。企業側は、更新の可否を判断する際に、更新回数、勤続年数、更新手続きの実態、労働者への説明内容などを総合的に考慮し、合理的な理由なく雇止めを行わないよう注意する必要があります。
Common scenarios
- ▸A company repeatedly renews a contract employee's 6-month contract for over 5 years, then suddenly decides not to renew without clear justification.
- ▸A manager tells a fixed-term worker 'we'll definitely renew your contract next term' but then the company changes its mind at contract expiration.
- ▸A part-time worker whose contract has been renewed automatically each year with minimal paperwork is told the position is being eliminated, without individualized reasoning.
- ▸An employer wants to reduce headcount and lets several fixed-term contracts lapse, but workers argue their renewal expectations were reasonable based on company practice.
- ▸A worker applies for contract renewal before expiration, but the employer delays response and then rejects it after the contract period ends.
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