A disposable diaper (1) is configured in such a manner that edges (7) of an outer cover body, the edges protruding in a crotch region further outward in the width direction than an absorption body, form portions of leg openings (9). The rear end (30R) of the absorption body is located within the crotch region (S3) so as not to overlap a waist elastic material (3A). In an absorption body mounting region in which the absorption body (40) is mounted, the ends of the outer cover body in the width direction are located on the inside, in the width direction, of the ends of the absorption body in the width direction, and portions of leg elastic materials are mounted in the absorption body mounting region.