Here is disclosed a disposable diaper having a pocket arranged so as to receive/retain body exudates which would otherwise flow to the side of the waist-opening, 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, a central sub-region in the transverse direction X of the belt region 23. The pocket 30 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 43 and the belt region 23, respectively, in the front-back direction, and being continuous with the pocket outside wall 43 through a folded portion 33 and extending downward from the fold line 33 so as to become continuous with the pocket inside wall 42 of the middle portion 41 in the belt region 23, 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 X.
