Underpants-type disposable wearing article

An underpants-type disposable wearing article comprising

• an integrated outer member provided to extend from a front body part to a back body part or outer members separately provided for the front body part and the back body part,
• an inner member attached to a middle part of the outer member in a width direction and provided to extend from the front body part to the back body part,
• side seal portions in which both side portions of the outer member in the front body part and both side portions of the outer member in the back body part are bonded to each other, respectively,
• a waist opening and a pair of right and left leg opening portions, and
• a dorsal side barrier provided to be closer to the waist opening than a crotch portion in the back body part,
• wherein the dorsal side barrier includes a first blocking position for blocking a movement of excrement toward a back side, and second blocking positions for blocking movements of the excrement toward both sides in the width direction,
• the dorsal side barrier includes a barrier sheet having a width wider than that of the first blocking position and extending from a front side of the first blocking position to the back side thereof,
• the barrier sheet includes a base portion adjacent to the first blocking position on the back side thereof, and a main portion adjacent to the first blocking position on the front side thereof,
• the base portion is fixed to a top surface of the back body part,
• the main portion has both side portions adjacent to the second blocking positions on outer sides thereof and an intermediate portion disposed between the second blocking positions,
• each of both the side portions of the main portion has a first portion extending on the front side of the first blocking position, a second portion being folded back toward a top side at a folding position along a front edge of the first portion and extending backward, and a third portion being folded back toward the top side at a folding position along a back edge of the second portion and extending forward,
• an underside surface of the first portion is fixed to the top surface of the back body part, an underside surface of the second portion is fixed to a top surface of the first portion, and the third portion is unfixed to the second portion,
• the intermediate portion of the main portion is unfixed to the top surface of the back body part,
• an elongated barrier elastic member is provided to extend in the width direction from one of the third portions to the other of the third portions in the main portion,
• a back end portion of the third portion is free of the elongated barrier elastic member, and
• the main portion is elastically contracted in the width direction together with the elongated barrier elastic member in a natural length state.