A disposable diaper (10) has: a pair of fastening tapes (90) and a liquid impermeable back sheet (60a) which is disposed on the surface of an absorption body which does not come into contact with the skin. The disposable diaper has: a back sheet arrangement region (R1) in which the back sheet (60a) is disposed and a region (R2) in which the back sheet (60a) is not disposed. The region (R2) in which the back sheet (60a) is not disposed is disposed at the front end section (10F) of the disposable diaper (10) and/or the rear end section (10R) of the disposable diaper. The rate of elongation of the region (R2) in which the back sheet (60a) is not disposed is higher than that of the back sheet arrangement region (R1). As a result of this configuration, the disposable diaper, which of tape type, is capable of appropriately covering the waist of the wearer in a manner corresponding to a change in the dimension of the waist of the wearer.本發明之課題在提供一種可對應穿用者的腰圍的尺寸的變化適當地覆蓋穿用者的腰圍之帶片型的用後即棄式紙尿布。用後即棄式紙尿布(10)具有:一對扣帶(90);以及配置在吸收體的非肌膚抵接面側的液不透過性的背面薄片(60a)。用後即棄式紙尿布具有:配置有背面薄片的背面薄片配置區域(R1);以及沒有配置背面薄片的背面薄片非配置區域(R2)。背面薄片非配置區域,是被配置在用後即棄式紙尿布的前側端部(10F)及用後即棄式紙尿布的後側端部(10R)的至少一方。背面薄片非配置區域的伸長率比背面薄片配置區域的伸長率更高。30‧‧‧後腰圍域25‧‧‧胯下域20‧‧‧前腰圍域90‧‧‧扣帶70‧‧‧側翼(側薄片)85‧‧‧腰圍伸縮部40T‧‧‧外側端部W‧‧‧製品寬幅方向L1‧‧‧製品長方向的直線50‧‧‧頂面薄片40‧‧‧吸收體40R‧‧‧後側端部10R‧‧‧後側端部10‧‧‧用後即棄式紙尿布92‧‧‧鉤薄片(卡合部)91‧‧‧基材薄片O5‧‧‧製品長方向的中心35R‧‧‧後側腿開口部77‧‧‧輔助伸縮部L2‧‧‧製品長方向的中心線77F‧‧‧前側端部751‧‧‧第1腿伸縮部O4‧‧‧製品長方向的中心35‧‧‧腿開口部752‧‧‧第2腿伸縮部D2‧‧‧距離35I‧‧‧內側端部O2‧‧‧中心點35F‧‧‧前側腿開口部77R‧‧‧後側端部36‧‧‧凸部O3‧‧‧製品長方向的中心O1‧‧‧製品長方向的中心75‧‧‧腿伸縮部37‧‧‧凹部75F‧‧‧前側端部90‧‧‧扣帶95‧‧‧目標部81‧‧‧彈性構件80‧‧‧腿側摺邊10F‧‧‧前側端部
