Patent ID: 8518008

Claim:
A pants-type disposable diaper having a longitudinal direction and a transverse direction transverse to the longitudinal direction, said disposable diaper comprising: an outer body including a belly side portion and a back side portion, an inner body comprising an absorbent including an absorption core, the belly side portion and the back side portion of the outer body being separated from each other and adjoined to each other at joint portions, the inner body being joined to the belly side portion and the back side portion of the outer body, to form a waist opening and a pair of leg openings, wherein each of the belly side portion and the back side portion of the outer body has a plurality of waist elastic members extending substantially parallel to each other in the transverse direction, each of the belly side portion and the back side portion includes an upper end facing the waist opening and a lower end opposing to the upper end in the longitudinal direction and facing the leg openings, the outer body has a transversely extending annular waist gather region in the belly side portion and the back side portion, the transversely extending annular waist gather region in the belly side portion located between the upper end of the belly side portion to a belly side end of the inner body, a transversely extending band-shaped belly side pressing region in the belly side portion, the transversely extending band-shaped belly side pressing region in the belly side portion located between the lower end of the belly side portion and a belly side end of the absorption core, a transversely extending band-shaped back side pressing region in the back side portion, the transversely extending band-shaped back side pressing region in the back side portion located between the lower end of the back side portion and a back side end of the absorption core, and a transversely extending annular tightening region in the belly side portion and the back side portion, the transversely extending annular tightening region in the back side portion located between a lower end of the waist gather region and an upper end of the back side pressing region, an area of the back side pressing region is smaller than an area of the belly side pressing region, a contractile force of the back side pressing region is smaller than a contractile force of the belly side pressing region, and is no greater than 0.35N, and a contractile force per unit width of the tightening region is no less than 0.45N/25 mm.