Patent ID: 8057455

Claim:
A pants type disposable diaper, comprising: an absorbent body, including an absorber and an outer packaging sheet formed integrally on the outer face side of the absorbent body, the outer packaging sheet comprising hip elastic bands and curved elastic bands; wherein the outer packaging sheet has a crotch portion for covering an area around a wearer's crotch, a front portion for covering a frontal portion of a wearer and a back portion for covering a backside portion of the wearer, the absorbent body being disposed in an area passing from the front portion to the back portion through the crotch portion; wherein the outer packaging sheet has leg cut lines at side edges to provide respective left and right leg openings, each of the front portion and the back portion being jointed at joint end portions at left and right sides thereof away from the crotch portion to form a waist opening when joined; wherein the outer packaging sheet has a first triangle area at said front portion extending to a side of said crotch portion that is generally delimited by the leg cut line for one leg, a nearest lateral edge portion of the absorber, and a lower portion of a nearest one of the hip elastic bands; wherein the hip elastic bands include a plurality of hip elastic members extending from one of the joint end portions toward another of the joint end portions, respectively, for each of the front portion and the back portion of the outer packaging sheet, the hip elastic members at each of the front portion and back portion, respectively, being arranged generally in parallel at a vertical spacing; wherein the curved elastic bands include a plurality of curved elastic members extending from left joint end portions and right joint end portions toward respective sides of the crotch portion while curving to a general contour of corresponding leg cut lines; wherein the plurality of curved elastic members have a spacing of 9 mm or less, are formed over an area of at least 30 mm in a direction normal to curved elastic members closest to the leg opening for each leg opening, cover the outer packaging sheet with an area coverage ratio of 70% or more, multiple curved elastic members of the plurality of curved elastic members covering the entire first triangle area at said coverage area ratio of 70% or more; and wherein the hip elastic members are fixed to the outer packaging sheet with adhesive applied around the hip elastic members, and the curved elastic members are fixed, without adhesive applied around the curved elastic members at least in the area where the hip elastic members are arranged, in an intersection with the hip elastic members by the adhesive applied around the hip elastic members.