PROBLEM TO BE SOLVED: To improve fitness of an edge part around the leg of an exterior body.SOLUTION: In at least one of exterior bodies 12F, 12B of an abdominal side exterior body 12F and a back side exterior body 12B: a part located on both sides in a width direction of an interior body 200 in a lower edge of a side edge part corresponding area that matches the side edge part in a back and forth direction forms edges Le of leg openings a lower part of the side edge part corresponding area is a folded part 12W which is folded zigzag once or more than once in the back and forth direction and fixed in the side edge part, folding is gradually unfolded downward as it goes to a central side in the width direction from the folded part 12 W and is fixed to the interior body 200 in the state that it is halfway or completely unfolded downward up to the central part in the width direction and there is provided a vertically slender diagonal elastic stretchable member 19 that is fixed in the state that it is extended from the folded part 12W along the direction toward the side edge below the folded part 12W in the interior body 200.
