A diaper (1) for low-weight infants, having: an absorbent body (21) comprising at least an absorbent core (21a); an outer sheet (24) arranged further on the non-skin side than the absorbent body (21); and a belt member (30). The belt member (30) comprises locking members (31A, 31B) on both one side and the other side in the longitudinal direction of the belt member (30). As a result of the locking member (31A) on one side, the belt member (30) is further on the inside in the longitudinal direction than an outside end (24leo) of the outer sheet (24) and, when the locking member is locked to the non-skin side of the outer sheet (24) in the thickness direction, an outside end (21leo) of the absorbent core (21a), in the longitudinal direction, is positioned further on the inside than the middle between the outside end (24leo) of the outer sheet (24) and an outside end (31Aleo) of the locking member (31A) on one side.
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