PROBLEM TO BE SOLVED: To provide a disposable diaper which can be easily manufactured even though it has regular wrinkles in a stretch part and excellent air permeability.SOLUTION: The problem can be solved by the disposable diaper in which a net-shaped elastic stretch member 13 including weft yarn parts 13x located along the width direction in parallel at intervals in the longitudinal direction across a waist edge part W, a waist lower part U, and the upper end part of a middle part L in an outer sheet 12, and warp yarn parts 13y located along the longitudinal direction in parallel at intervals in the width direction are fixed in a state extended only in the width direction. In the fixed area of the net-shaped elastic stretch member 13, contraction of weft yarn parts 13x in a width direction makes the fixed parts of adjacent warp yarn parts 13y be close one another and longitudinal wrinkles continued in the longitudinal direction are set in parallel at an interval of the warp yarn parts 13y in the width direction.
