PROBLEM TO BE SOLVED: To provide an underpants type disposable diaper which improves air permeability of an exterior body while stably fixing an elastic member arranged in the state that it is extended in a curved shape and whose exterior body is easily softened with improved feeling.SOLUTION: An underpants type disposable diaper 1A of the present invention is provided with an exterior body 5 arranged on a non-skin opposite surface side of an absorbent body 10. The exterior body 5 has leg elastic members 55 arranged between an outer layer sheet 51 and an inner layer sheet 52 in the state that they are stretched in a curved shape along a leg opening LO and adhesive 7 for a plurality of legs fixing the leg elastic members 55. Each of the adhesive 7 for legs is arranged along a Y direction in an area where the leg elastic members 55 in an X direction are arranged in a diaper unfolded state. Each of the adhesive 7 for legs is arranged at different intervals of two or more kinds between the adhesive 7, 7 for legs adjacent in the X direction.SELECTED DRAWING: Figure 4
