PROBLEM TO BE SOLVED: To provide a disposable diaper having a waist part which shows excellent touch feeling without causing an end edge to be opened, is excellent in a response to stretching, and shows high air permeability.SOLUTION: A disposable diaper 1 includes an abdominal side part 1A on one side and a back side part 1B on the other side in a longitudinal direction X. End part areas 1Ae, 1Be in the longitudinal direction X in the abdominal side part 1A or the back side part 1B are constituted of a laminated structure of a plurality of sheets 31, 32. End edges 1At, 1Bt extending in a width direction Y in the end part areas 1Ae, 1Be comprise a fusion part 40 formed by fusing the plurality of the sheets 31, 32. A thickness T of the fusion part 40 is smaller than the sum of the individual thicknesses of the plurality of the sheets 31, 32 that constitute the fusion part 40.
