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 absorbent body (30) has a non-joined section (30a) that is not joined to the skin-facing surface of the connecting part (40) at the end section in the lengthwise direction of the diaper, and a joined section (30b) that is joined to the skin-facing surface of the connecting part (40) on the crotch-side of the non-joined section (30a) in the lengthwise direction.本發明的課題是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,可提高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的向上摺部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,而吸收性本體30具有:非接合部位30a,在尿布的長度方向端部不接合於連結部40之面向肌膚面;以及接合部位30b,較該非接合部位30a在長度方向更靠下襠部側而接合於連結部40之面向肌膚面。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30a‧‧‧非接合部位30b‧‧‧接合部位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52‧‧‧外面片100‧‧‧拋棄式尿布
