A standing gather (15) in a disposable diaper (1) includes: a base end part that cannot stand and a standing part which can shrink in the length direction by means of an elastic member and can stand at the base end part toward the skin-facing side as observed in the thickness direction. The base end part has: first base end parts which are respectively arranged on both the outer sides relative to the standing part as observed in the length direction and second base end parts each of which is arranged on the outer side relative to the standing part as observed in the width direction. The standing part has a bonding part (153) at which side sheets (14) are bonded to each other on the inner side relative to each of the second base end parts as observed in the width direction. The bonding part is provided in a rear side region (2). An absorbent material (11) in the rear side region (2) has a high-stiffness part (19).用後即棄式紙尿褲(1)的立體摺邊(15),是包含:不能立起的基端部、以及可立起的立起部,該立起部,是藉由彈性構件在長邊方向收縮,而以基端部為支點朝厚度方向的肌膚側立起。基端部,是具有:比立起部更被配置在長邊方向的兩外側的第1基端部、以及比立起部更被配置在寬邊方向的外側的第2基端部。立起部具有在比第2基端部更位於寬邊方向的內側接合側薄片(14)彼此的接合部(153)。接合部被配置在後側域(2)。後側域(2)的吸收體(11)具有比位在用後即棄式紙尿褲的長邊方向中心的吸收體更剛性高的高剛性部(19)。1‧‧‧用後即棄式紙尿褲2‧‧‧後側域3‧‧‧前側域10‧‧‧吸收性本體11‧‧‧吸收體11a‧‧‧吸收芯11b‧‧‧芯包層15‧‧‧立體摺邊16‧‧‧腿褶邊18‧‧‧線條19‧‧‧高剛性部20‧‧‧後側外裝體21‧‧‧後側薄片22‧‧‧後側彈性構件30‧‧‧前側外裝體31‧‧‧前側薄片32‧‧‧前側彈性構件181‧‧‧第1凸頂部182‧‧‧第2凸頂部183‧‧‧第3凸頂部184‧‧‧後側線條185‧‧‧前側線條186‧‧‧中央線條187‧‧‧缺口1871‧‧‧第1缺口部1872‧‧‧第2缺口1873‧‧‧第3缺口L‧‧‧長邊方向W‧‧‧寬邊方向
