A disposable diaper in which a waist opening portion and right-and-left leg opening portions are formed in a use state having: an elastic portion where a plurality of elastic members is provided along a width direction with an interval of not more than 7.0 mm in a longitudinal direction, and a non-elastic portion where no elastic member is provided, at least at an under waist portion of a body peripheral region of a length range from a waist opening edge to a leg opening start end, wherein the non-elastic portion is in a center of at least one of a front side and a back side and the elastic portion is provided in a region including right-and-left side portions except the non-elastic portion, and a difference between a maximum product width obtained when the body peripheral region is extended to a limit of extension in a product width direction and a contracted product width obtained when the body peripheral region is in a non-extended contraction state is from 100 to 250 mm in a state where the front side and the back side are overlapped.
