Japan Issues MHLW Ordinance to Implement Occupational Safety Law Amendments

What The Ordinance Covers

The gazette sets out MHLW Ministerial Ordinance No. 3 of 20 January 2026, an “ordinance for the development of related ministerial ordinances” accompanying partial commencement of the 2025 amending act. The extracted provisions show amendments across implementing rules, including chemical-related duties and workplace control requirements.

One notable area concerns notifications that use an alternative chemical name for a component. The ordinance text indicates that where an alternative name is used, there are specific recordkeeping and disclosure expectations: relevant ingredient information must be retained for a defined period and disclosed without delay when needed for occupational health management, including to an occupational physician or other designated medical professional. The same framework anticipates disclosure in response to oversight needs, with confidentiality protections to limit disclosure to what is necessary.

Implications For Chemical Risk Management And Contractors

The published amendments also touch on protective equipment and exposure control obligations in regulated chemical work. The text shows requirements framed around “persons engaged in the work”, alongside provisions addressing situations where work is subcontracted. In practice, this increases the importance of ensuring respiratory protection and other control requirements are communicated consistently across contractor chains, not only to direct employees.

Separately, the ordinance includes updates that relate to alarms, signage, and workplace warnings in scenarios such as fires or releases of particularly harmful chemicals in leased buildings, reinforcing that chemical incident readiness is part of broader workplace safety governance.

What Companies Should Do Now

Chemical companies operating in Japan should review how they handle confidential ingredient disclosures when alternative names are used, confirm retention and handover processes, and pressure-test contractor management workflows so that protective equipment requirements are clearly communicated and auditable across all parties performing the work.

Summary

Japan’s publication of MHLW Ministerial Ordinance No. 3 in the Official Gazette updates implementing requirements tied to phased OSH law amendments, with practical relevance for chemical disclosure processes and for communicating exposure controls and PPE expectations across increasingly complex contractor ecosystems.