Here is disclosed a disposable diaper (10) having a pocket (30) arranged so as to receive/retain body exudates which would otherwise flow to the side of the waist-opening (21), thereby restricting a possibility that body exudates may get into touch with the wearer’s skin. A back waist region (14) includes a belt region (23) extending in a transverse direction (X) on a skin-facing surface and a downward openable pocket (30) facing, in a front—back direction (Z), a central sub—region in the transverse direction of the belt region. The pocket is defined by a pocket outside wall (43) facing the middle portion (41) in the front-back direction and extending upward from the crotch region (15), a pocket inside wall (42) facing the pocket outside wall and the belt region, respectively, in the front—back direction, and being continuous with the pocket outside wall through a folded portion (33) and extending downward from the fold line so as to become continuous with the pocket inside wail of the middle portion in the belt region, and both pocket lateral portions (32) formed from the respective lateral portions of the inside and outside walls (42, 43) and tucked inward in the transverse direction.
