Article 31-3

①When persons engaged in work (limited to workers and to persons engaged in work, other than workers, who are engaged in work on a job at the same site as workers) associated with two or more employers or individual business operators (meaning persons conducting a business who do not employ workers; the same applies hereinafter) who are carrying out jobs involved in business undertakings categorized as the construction industry are doing work at one site involving machinery which is specified by Order of the Ministry of Health, Labour and Welfare (hereinafter referred to as "specified work" in this Article), an original orderer that directly carries out a job associated with the specified work or a person that has been contracted for all of that job, that contracts out a part of the job at that site must take the necessary measures to prevent industrial injuries among all of the workers engaged in the specified work at that site pursuant to Order of the Ministry of Health, Labour and Welfare.

②In a case as referred to in the preceding paragraph, if there is no person that, pursuant to the provisions of that paragraph, is required to take the measures prescribed in that paragraph, the principal employer with a business undertaking categorized as the construction industry that has contracted out all of the jobs associated with specified operation at that site to contractors or the employer specified pursuant to the provisions of paragraph (2) or (3) of Article 30 that is carrying out an undertaking categorized as the construction industry must give the necessary consideration for preventing industrial accidents among all of the workers who are engaged in the specified operation at the site, such as nominating a person to carry out the measures designated in the preceding paragraph.