A disposable diaper (1) which is provided with a waist opening (WO) and a pair of leg openings (LO) is provided with a composite stretchable member (5) at least at side parts (WPE) of a waist part (WP) which is positioned between the waist opening and the leg openings of the disposable diaper. The composite stretchable member is provided with first and second nonwoven fabric sheet parts (6U, 6L) and elastic members (7) which are arranged between these. Each of the first and second nonwoven fabric sheet parts is provided with a plurality of convex-concave regions (41) which are provided with convex parts (51) and concave parts (53) which are alternately repeated along the transverse direction (L) and which extend in the longitudinal direction (T) and at least one non-shaped region (43) which separates these convex-concave regions from each other in the longitudinal direction. The first and second nonwoven fabric sheet parts are overlaid so that the convex-concave regions of the first nonwoven fabric sheet part and the second nonwoven fabric sheet part adjoin each other and the non-shaped regions of the first nonwoven fabric sheet part and the second nonwoven fabric sheet part are separated from each other and are joined with each other by an adhesive which is applied to the elastic members.
