Is job evaluation required by law in Japan?

What Japan's law covers — and what it doesn't

Japan is the largest economy in the same-work-only tier. Article 4 of the Labor Standards Act (1947) prohibits employers from discriminating against women in wages by reason of sex — a real and enforceable protection, but one Japanese courts apply to the same or substantially the same work. There is no equal-value standard: nothing in Japanese law requires comparing a female-dominated job with a differently-titled male-dominated job of equivalent demands, and consequently no job evaluation requirement exists.

The gap is conspicuous because of Japan's treaty position. Japan ratified ILO Convention 100 in 1967, committing to equal remuneration for work of equal value — and the ILO's supervisory bodies have repeatedly observed that Article 4's same-work scope falls short of that commitment. Occupational segregation does much of what overt wage discrimination once did: where women and men hold different jobs, Article 4 simply has nothing to compare.

Recent policy has favored transparency over valuation: under the Act on Promotion of Women's Participation and Advancement, larger employers must disclose gender pay gap figures publicly. Disclosure sharpens the question — Japan's headline gender pay gap remains among the widest in the OECD — but the law still provides no mechanism that values unlike jobs against each other.

Who must comply

Article 4 binds all employers, with violations carrying penal sanctions, and the disclosure duties reach large employers. But the compliance bar is structurally low: an employer whose men and women never hold the same jobs faces little exposure under a same-work standard, however large its pay gap.

The compliance-gap story

For multinational employers, Japan is the clearest illustration that local legality is not group-level equity. A pay structure that is fully compliant in Tokyo may be indefensible under the equal-value tests of the EU Pay Transparency Directive, Canadian statute, or Korean law — all built on the four-factor comparison Japanese law never requires. Companies reporting a Japanese gender pay gap with no value-based explanation behind it should also expect investor and workforce questions that Article 4 compliance cannot answer.

How point-factor job evaluation helps — even without a mandate

• Explaining the disclosed gap — published pay gap figures invite "why?" A factor-based analysis separates occupational-mix effects from like-for-like and equal-value inequities, giving the disclosure a defensible narrative.
• Convention-level coherence — employers aligning to ILO Convention 100 group-wide can apply the same skill/effort/responsibility/conditions framework in Japan, ahead of any domestic requirement.
• Early-mover position — Japan's combination of treaty commitment, ILO observations, and widening disclosure is the classic precursor pattern. Employers who build analytical job evaluation now will treat any future equal-value reform as an administrative update rather than a pay-structure reckoning.

Japan's law asks only whether the same job is paid the same. The harder question — whether different jobs of equal value are — is one global employers increasingly have to answer anyway.

The law

Official tools and downloads for Japan

Government-published job evaluation tools, guides, and templates — each links directly to the official source.

Frequently asked questions

Related