It is an object to provide a disposable diaper which can protect the navel while suppressing the stimulation to the wearer's skin and can reduce stress of mothers on the stimulation to the skin. The front edge of the disposable diaper (10) includes a curved recess (111) recessed rearward in a region including the center of the disposable diaper in the width direction, and a front straight portion (112) extending parallel to the width direction from the outer edge of the recess. The rear edge (12) of the disposable diaper includes a curved projection (121) protruding rearward in the region including the center of the disposable diaper in the width direction, and a rear straight portion (122) extending parallel to the width direction from the outer edge of the projection. The disposable diaper includes: a pair of first cutout portions (15) recessed rearward in a curved shape from the outer edge of the front straight portion and recessed inward in the width direction in a curved shape from the front edge of the outer edge of the disposable diaper； and a pair of second cutout portions (16) recessed frontward in a curved shape from the outer edge of the rear straight portion and recessed inward in the width direction in a curved shape from the rear edge of the outer edge of the disposable diaper.
