If maternity leave (meaning not engaging in labor for the period from 42 days (98 days in the case of multiple fetuses) before the day of childbirth (the due date of childbirth if the day of childbirth is after the due date of childbirth) to 56 days after the day of childbirth (limited to not engaging in labor for reasons relating to pregnancy or childbirth); hereinafter the same applies) taken by an insured person ends and the person is taking care of a child to which the maternity leave pertains on the last day of the maternity leave (referred to as "last day of maternity leave" hereinafter in this Article) after submitting a request to the insurer via the employer of the place of business employing the person as specified by Order of the Ministry of Health, Labour and Welfare, the standard monthly remuneration amount is revised by setting the amount obtained by dividing the total amount of remuneration received for the three months beginning with the month which includes the day following the last day of maternity leave (limited to a period of consecutive employment at the place of business employing the person on the day following the last day of maternity leave; and excluding any month in which the number of days based on which remuneration is paid is less than 17 days) by the number of months in that period as the monthly remuneration amount, notwithstanding the provisions of Article 41; provided, however, that this does not apply to an insured person who commences childcare leave on the day following the last day of maternity leave.
保険者等は、産前産後休業（出産の日（出産の日が出産の予定日後であるときは、出産の予定日）以前四十二日（多胎妊娠の場合においては、九十八日）から出産の日後五十六日までの間において労務に服さないこと（妊娠又は出産に関する事由を理由として労務に服さない場合に限る。）をいう。以下同じ。）を終了した被保険者が、当該産前産後休業を終了した日（以下この条において「産前産後休業終了日」という。）において当該産前産後休業に係る子を養育する場合において、その使用される事業所の事業主を経由して厚生労働省令で定めるところにより保険者等に申出をしたときは、第四十一条の規定にかかわらず、産前産後休業終了日の翌日が属する月以後三月間（産前産後休業終了日の翌日において使用される事業所で継続して使用された期間に限るものとし、かつ、報酬支払の基礎となった日数が十七日未満である月があるときは、その月を除く。）に受けた報酬の総額をその期間の月数で除して得た額を報酬月額として、標準報酬月額を改定する。ただし、産前産後休業終了日の翌日に育児休業等を開始している被保険者は、この限りでない。
A standard monthly remuneration amount revised pursuant to the provisions of the preceding paragraph is the standard monthly remuneration amount for each month since the month following the month which includes the day on which two years have elapsed since the day following the last day of maternity leave until August in that year (August in the following year if that following month is any of September to December).