Patent ID: 9681998
Date: 2017-06-20
CPC Classifications: A61F

Claim:
1. An underpants-type disposable diaper, comprising: an outer sheet forming a front body part and a back body part; and an inner body having a perimeter and including an absorbent body and fixed to an internal surface of the outer sheet, the front and back body parts of the outer sheet being joined to each other at respective side portions thereof to form a waist opening and a pair of leg openings, wherein the outer sheet of the back body part has an intergluteal cleft facing portion located at a lateral center portion and side areas located laterally to the right and left of the intergluteal cleft facing portion, respectively, a portion of each of the side areas, which is adjacent to the intergluteal cleft facing portion and within the boundaries of the inner body perimeter, is located so as to be apart from an edge of the outer sheet of the back body part toward a lateral center side, the outer sheet of the back body part has an elongated intergluteal cleft portion elastic member extended laterally over the intergluteal cleft facing portion and within the boundaries of the inner body perimeter, the intergluteal cleft portion elastic member is cut at the portion of each of the side areas, which is adjacent to the intergluteal cleft facing portion, the back body part has at the intergluteal cleft facing portion a bending fit portion which is bent so as to enter into the intergluteal cleft of a wearer by the intergluteal cleft portion elastic member acting a contraction force on the intergluteal cleft facing portion, the outer sheet has at each of the front and back body parts a lifting elastic member which exerts a contraction force of a vertical component to lift a crotch portion toward a waist side, each lifting elastic member is cut at the portion of each of the side areas, which is adjacent to the intergluteal cleft facing portion and within the boundaries of the inner body perimeter.