A well-fitting disposable diaper having a front gathering to be applied to the crotch of a wearer. The front gathering is formed by elastic members disposed about a border between a crotch region and a front waist region of the diaper and includes one end portions of first and second thin parts which are disposed in the crotch region and the front waist region, respectively. Because the first thin parts are elongated between the second thin parts in the front gathering, the front gathering can readily shrink to press the crotch of a wearer or a protector against incontinence to be applied thereto.