Abstract: A disposable diaper including a topsheet, and a topsheet is covered, at least in one of front and rear waist regions, with a liquid-resistant sheet bonded to a longitudinal end and transversely opposite side edges of that one of the front and rear waist regions; an elastic foamed member which is folded in two along a folding axis zone extending longitudinally thereof and has a first portion placed against the upper surface of the topsheet and a second portion placed against the lower surface of a liquid-resistant sheet is disposed between the topsheet and the liquid-resistant sheet in such a manner that the foamed member lies on an upper portion of a core in that one of the front and rear waist regions.