This composite stretch material (3) is composed of a first nonwoven fabric sheet and a second nonwoven fabric sheet (1U 1L) and elastic members (2) disposed therebetween. In each nonwoven fabric sheet recessed portions (51) and protruded portions (53) are formed in the thicknesswise direction. The recessed and protruded portions formed alternately repeatedly in a first direction configure recess protrusion lines (41). The recess protrusion lines (41) are separated from each other by flat regions (43) which contain neither recessed portions nor protruded portions and which extend along the first direction. The flat regions (43) are joined to each other with the elastic member therebetween. The protruded portions of the first nonwoven fabric sheet enter respectively into the recessed portions of the second nonwoven fabric sheet while the protruded portions of the second nonwoven fabric sheet enter respectively into the recessed portions of the first nonwoven fabric sheet.
