An employer must not create differences between the base pay, bonuses, and other treatment of the part-time/fixed term workers it employs and its corresponding treatment of its workers with standard employment statuses that are found to be unreasonable in consideration of the circumstances, including the substance of the duties of those part-time/fixed term workers and workers with standard employment statuses and the level of responsibility associated with those duties (hereinafter referred to as the "job description") and the scope of changes in their job descriptions and assignment, that are found to be appropriate in light of the nature of the treatment and the purpose of treating workers in that way.
事業主は、その雇用する短時間・有期雇用労働者の基本給、賞与その他の待遇のそれぞれについて、当該待遇に対応する通常の労働者の待遇との間において、当該短時間・有期雇用労働者及び通常の労働者の業務の内容及び当該業務に伴う責任の程度（以下「職務の内容」という。）、当該職務の内容及び配置の変更の範囲その他の事情のうち、当該待遇の性質及び当該待遇を行う目的に照らして適切と認められるものを考慮して、不合理と認められる相違を設けてはならない。