PROBLEM TO BE SOLVED: To provide an underpants-type disposable diaper capable of preventing roll-up of a waist end part.SOLUTION: A waist end part W of an outer wrapper body 12 at least in one of a front piece F and a back piece B, includes, at least in a waist opening WO side: an outer stretchable part 70 elastically stretching in the width direction； and an inner stretchable part 80 that is overlapped on the outer stretchable part 70, is not continuously joined with an inner surface of the outer stretchable part 70 between side seals 12A in the width direction, and elastically stretches in the width direction.SELECTED DRAWING: Figure 10
