According to the present invention, an exterior body (3) has an exterior body contraction region (35) in which waistline elastic members (5) are disposed intermittently in a longitudinal direction (X), between an outer layer sheet (31) and an inner layer sheet (32) of an extension and contraction section that can extend and contract in a lateral direction (Y), in a state where the waistline elastic members (5) are extended in the lateral direction (Y). Ridges (36) and grooves (37) that extend in the longitudinal direction (X) are alternately disposed in the lateral direction (Y) on the skin-facing surface side of the exterior body contraction region (35). The sheets (31, 32) have, in the exterior body contraction region (35), through-holes (33) formed in the grooves (37) that are located outward of the end portion, in the longitudinal direction, of an absorbent body (23). A plurality of recesses (211) which extend in the longitudinal direction (X), and a plurality of protrusions (210)are formed in a skin-facing surface of a surface sheet (2) such that the recesses (211) are located at the same positions as the grooves (37) in the lateral direction (Y).