Provided is a disposable diaper that protects the navel while suppressing irritation to the skin of a wearer and that can reduce stress on mothers concerning irritation to the skin. A front edge (11) of a disposable diaper (10) has a curve-shaped recessed part (111) that is recessed toward the rear side, in an area including the widthwise center of the disposable diaper, and front straight parts (112) extending from the outer edges of the recessed part so as to be parallel to the width direction, and a rear edge (12) of the disposable diaper has a curve-shaped projecting part (121) projecting toward the rear side, in an area including the widthwise center of the disposable diaper, and rear straight parts (122) extending from the outer edges of the projecting part so as to be parallel to the width direction. The disposable diaper has a pair of first cut-out parts (15), which are recessed, in a curved manner, from the outer edges of the front straight parts toward the rear side and are recessed, in a curved manner, from the front edges of the outer edges of the disposable diaper toward the widthwise inner side, and a pair of second cut-out parts (16), which are recessed, in a curved manner, from the outer edges of the rear straight parts toward the front side and are recessed, in a curved manner, from the rear edges of the outer edges of the disposable diaper toward the widthwise inner side.
