To increase ventilation in an area where a tuck is formed in a disposable diaper separated into a front panel outer body, a rear panel outer body, and an absorbent body. A disposable diaper equipped with a front panel outer body (10), a rear panel outer body (20), and an absorbent body (30), wherein: the absorbent body (30) is connected, via a connecting part (40) having a peak fold (41) and a valley fold (42) that extend in the widthwise direction of the diaper, to the front panel outer body (10) and/or the rear panel outer body (20) the connecting part (40) is obtained by layering, in the thickness direction, a liquid-impermeable leakage prevention sheet (51) and an outer-surface nonwoven sheet (52) positioned on the surface of the leakage prevention sheet (51) that does not face the skin and the outer-surface nonwoven sheet (52) extends so as to project in the lengthwise direction of the diaper beyond the end edge of the upper-end edge (51a) and/or the lower-end edge (51b) of the leakage prevention sheet (51).本發明的課題:在分離成前身外裝體、後身外裝體、及吸收性本體的拋棄式尿布中,提高形成活褶形成部位的通氣性。本發明的解決手段係提供一種拋棄式尿布,具備前身外裝體10、後身外裝體20、及吸收性本體30,其中,吸收性本體30係經由具有延伸於尿布寬度方向之向上摺部41及向下摺部42的連結部40而連結於前身外裝體10與後身外裝體20之兩者或任一者的外裝體,而連結部40則為不透液性防漏片51與位在防漏片51之非面向肌膚面側的外面不織布片52層疊於厚度方向的結構,外面不織布片52在尿布長度方向中延伸超過防漏片51的上端緣51a及下端緣51b之兩者或任一者端緣。10‧‧‧前身外裝體11‧‧‧內片12‧‧‧外片13‧‧‧腰間伸縮構件20‧‧‧後身外裝體21‧‧‧內片22‧‧‧外片23‧‧‧腰間伸縮構件30‧‧‧吸收性本體31‧‧‧吸收體32‧‧‧上片33‧‧‧背片34‧‧‧蓋片40‧‧‧連結部40A‧‧‧前側連結構件40B‧‧‧後側連結構件41‧‧‧向上摺部42‧‧‧向下摺部43‧‧‧中間區域44‧‧‧內側區域44a‧‧‧接合部位45‧‧‧外側區域45a‧‧‧接合部位46‧‧‧連結部伸縮構件51‧‧‧防漏片51a‧‧‧上端緣51b‧‧‧下端緣52‧‧‧外面不織布片100‧‧‧拋棄式尿布
