This disposable diaper (10) is configured in a manner so that the end (E2) at the front torso-encircling region (20) side of an extendable/contractable range in a leg extension/contraction section (75) is more proximal to the end (E4) at the front torso-encircling region (20) side of the disposable diaper (10) than the end (E3) at the front torso-encircling region (20) side of an extendable/contractable range of a crotch extension/contraction section (200a). The end (E5) at the back torso-encircling region (30) side of the extendable/contractable range in the leg extension/contraction section (75) is configured in a manner so as to be more proximal to the end (E7) at the back torso-encircling region (30) side of the disposable diaper (10) than the end (E6) at the back torso-encircling region (30) side of the extendable/contractable range of the crotch extension/contraction section (200a). The tensile modulus of the crotch extension/contraction section (200a) is greater than the tensile modulus of the leg extension/contraction section (75).用後即棄式紙尿布(10)，是構成在腿伸縮部(75)可伸縮的範圍的前腰圍域(20)側的端部(E2)，比在胯下伸縮部(200a)可伸縮的範圍的前述後腰圍域(20)側的端部更接近用後即棄式紙尿布(10)的前腰圍域(20)側的端部(E2)。在腿伸縮部(75)可伸縮的範圍的後腰圍域(30)側的端部(E5)，是構成比在胯下伸縮部(200a)可伸縮的範圍的前述後腰圍域(30)側的端部(E6)更接近用後即棄式紙尿布(10)的後腰圍域(30)側的端部(E7)。胯下伸縮部(200a)的拉伸係數比腿伸縮部(75)的拉伸係數更大。
