A diaper (1) for low-weight infants, having an absorbent body (2), an outer sheet (5), and a pair of belt members (20). The belt members (20) comprise locking members (22) on one side and the other side in the longitudinal direction thereof and can lock to the non-skin-side surface of the outer sheet (5) by using the locking members (22). The diaper has a mark (30) indicating the locking position for the belt members (20) in the non-skin-side surface of the outer sheet (5) and the mark (30) is visible from the non-skin-side surface of the outer sheet (5).[課題] 在提供一種不易刺激低體重兒的肌膚，且可順暢地更換的低體重兒用紙尿布。[解決手段] 一種低體重兒用紙尿布(1)，係具有：吸收體(2)與外裝薄片(5)和一對的帶構件(20)，帶構件(20)，是在其長邊方向的一方側及另一方側具備卡止構件(22)，且藉由卡止構件(22)可卡止在外裝薄片(5)的非肌膚側面，其特徵為，具有表示外裝薄片(5)的非肌膚側面中的帶構件(20)的卡止位置之印記(30)，印記(30)可從外裝薄片(5)的非肌膚側面視認。
