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. The bonding part is located apart from each of the first base end parts across the length-direction center (1LC) of the disposable diaper. The length-direction length (L4) of the bonding part in a rear side region is longer than the length-direction length (L5) of the bonding part in a front side region.提供一種藉由立體摺邊抑制糞便漏出的用後即棄式紙尿褲。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。立起部具有接合側薄片(14)彼此的接合部(153)。接合部，是跨用後即棄式紙尿褲的長邊方向的中心(1LC)，與第1基端部的各個分開。後側域的接合部的長邊方向的長度(L4)比前側域的接合部的長邊方向的長度(L5)更長。
