An employer, pursuant to Order of the Ministry of Health, Labour and Welfare, must have workers undergo medical checkups by a physician (excluding the medical checkups prescribed in the provisions of paragraph (1) of Article 66-10; hereinafter the same applies in this and the following Articles).
事業者は、労働者に対し、厚生労働省令で定めるところにより、医師による健康診断（第六十六条の十第一項に規定する検査を除く。以下この条及び次条において同じ。）を行わなければならない。
An employer, pursuant to Order of the Ministry of Health, Labour and Welfare, must implement medical checkups by a physician regarding customized test items for workers engaged in hazardous work operations specified by Cabinet Order. The same applies for workers that the employer has ever had engage in hazardous work operations specified by Cabinet Order and who it currently employs.
On finding it to be necessary to do so in order to help maintain the health of workers, the Director of the Prefectural Labour Bureau may instruct employers on the basis of the opinions of a senior industrial health physician and pursuant to Order of the Ministry of Health, Labour and Welfare, to implement extra medical checkups or otherwise do as is necessary.
A worker must undergo a medical checkup that the employer implements pursuant to the provisions of the preceding paragraphs; provided, however, that this does not apply if a worker who does not desire to undergo the medical checkup by the physician or dentist designated by the employer undergoes a medical checkup by another physician or dentist that is equivalent to the medical checkup under these provisions, and submits a document to the employer certifying the results.
Read this with the articles around it