Patent ID: 8187244

Claim:
An underpants type disposable diaper having a front body part and a back body part which are joined at sides, thereby to form a waist opening and a pair of right and left leg openings, wherein joined sections at sides of the front body part and back body part are formed with a large number of unit fusing portions arranged at uniform intervals, in a longitudinal direction, provided with groups each having continuous unit fusing portions of the same height, and divided into segments according to the groups of unit fusing portions of different heights; the joined sections are each divided, in a direction from a side end of the waist opening to a side end of the leg opening, into four segments comprising a waist segment, an upper side segment, an intermediate side segment, and a lower side segment, the segments having a relationship with respect to the number of laminated sheets wherein the number of laminated sheets of the upper side segment is greater than the number of laminated sheets of the waist segment which is greater than or equal to the number of laminated sheets of the intermediate side segment which is greater than the number of laminated sheets of the lower side segment, and the segments having a relationship with respect to the height in the longitudinal direction of unit fusing portions wherein the height of unit fusing portions of the upper side segment is greater than the height of unit fusing portions of the waist segment which is greater than or equal to the height of unit fusing portions of the intermediate side segment which is greater than the height of unit fusing portions of the lower side segment.