A disposable diaper includes the sheet-like leg hole stretch unit provided to a side end in a product widthwise direction of the side flap, extending in a product longitudinal direction, and being partially stretchable at least in the product longitudinal direction. A side edge in the product widthwise direction of the leg hole stretch unit is in a meandering shape in the product longitudinal direction. A distance between the side edge in the product widthwise direction of the leg hole stretch unit and a center line changes from the front waistline unit to the back waistline unit. The concave unit and the concave unit resulting from a shift of an amount of change in the distance from decrease to increase are provided closer to the back waistline unit than a center in the product longitudinal direction of the disposable diaper.
