A pants-type disposable diaper (1) includes a pair of strip projecting parts (13) projecting laterally from a line of connection between front and rear parts located respectively on the belly and back sides of a wearer, a first waist elastic member (443) joined to a first waist region (407) that is an upper part of a waist region (406) extending along a waist opening, and a second waist elastic member (444) joined to a second waist region (408) that is a lower part of the waist region (406). In a state in which an outer covering sheet (4) is elongated in a right-left direction, a first unit contractile force that is a contractile force in the right-left direction per unit width of the first waist region (407) in an up-down direction is smaller than a second unit contractile force in the second waist region (408). Accordingly, it is possible to suppress cutting in of the upper end portions of the pair of strip projecting parts (13) into the skin of the wearer and to prevent the disposable diaper (1) from slipping off in the up-down direction when being worn.
