An adult disposable diaper comprising: an absorber; a laminated sheet in which a plurality of sheets are laminated so as to envelope the absorber; and left and right rising gathered units (4, 5) to extend in a longitudinal direction on a wearer-facing surface of the laminated sheet, wherein the diaper is divided into a front section, a middle section and a back section corresponding to a lower abdomen, a crotch and buttocks of a wearer, respectively, wherein the absorber comprises left and right first notches (8, 9) to extend inward in a width direction of the absorber in a boundary region between the front section and the middle section and comprises left and right second notches (10, 11) to extend inward in the width direction of the absorber in a boundary region between the middle section and the back section, wherein the laminated sheet comprises left and right third notches (18, 19) to extend inward in a width direction of the laminated sheet toward the first notches (8, 9) in the boundary region between the front section and the middle section, wherein left and right thigh absorbers (6, 7) that are used by being bent so as to face inner thighs in the crotch of the wearer are formed by left and right side parts of the absorber in the middle section, wherein elastic bodies (22a, 22b, 22c, 22d) are provided at roots of the left and right thigh absorbers (6, 7) in a region opposite to the wearer-facing surface in the laminated sheet, and wherein left and right recessed grooves (23, 24) to extend in the front-back direction are provided closer to the center of the absorber than the roots of the left and right thigh absorbers (6,7). an absorber; a laminated sheet in which a plurality of sheets are laminated so as to envelope the absorber; and left and right rising gathered units (4, 5) to extend in a longitudinal direction on a wearer-facing surface of the laminated sheet, wherein the diaper is divided into a front section, a middle section and a back section corresponding to a lower abdomen, a crotch and buttocks of a wearer, respectively, wherein the absorber comprises left and right first notches (8, 9) to extend inward in a width direction of the absorber in a boundary region between the front section and the middle section and comprises left and right second notches (10, 11) to extend inward in the width direction of the absorber in a boundary region between the middle section and the back section, wherein the laminated sheet comprises left and right third notches (18, 19) to extend inward in a width direction of the laminated sheet toward the first notches (8, 9) in the boundary region between the front section and the middle section, wherein left and right thigh absorbers (6, 7) that are used by being bent so as to face inner thighs in the crotch of the wearer are formed by left and right side parts of the absorber in the middle section, wherein elastic bodies (22a, 22b, 22c, 22d) are provided at roots of the left and right thigh absorbers (6, 7) in a region opposite to the wearer-facing surface in the laminated sheet, and wherein left and right recessed grooves (23, 24) to extend in the front-back direction are provided closer to the center of the absorber than the roots of the left and right thigh absorbers (6,7).