A pull-on disposable wearing article is provided with a chassis and an absorbent batt structure extending on the inner surface of the chassis. The chassis has a front waist region, a rear waist region and a crotch region and is composed of a base sheet which is substantially not elastically extensible/contractible, and first and second outer sheets stretched in a transverse direction and bonded in such a stretched state to outer surfaces of the base sheet in the front and rear waist regions, respectively, and being elastically extendible/contractible in the transverse direction. An absorbent batt structure is laid inside the chassis. The base sheet defining an inner surface of the chassis is formed with gathers as the first and second outer sheets contract.