PROBLEM TO BE SOLVED: To provide a disposable diaper capable of maintaining an initial position of a waist band even in a forward bending posture and suppressing leakage from a buttocks. A disposable diaper (10) has a skin side sheet (20) and a waist band (80). The waist band has an upright portion (85) that is configured to be upright, and a base end that serves as an upright fulcrum. The base end portion includes a front and rear base end portion (84) adjacent to the upright portion in the front-rear direction, and a width base end portion (87) adjacent to the upright portion in the width direction. The upright portion is an extension portion (88) extending in the front-rear direction from the front-rear base end edges, and a skin contact portion (89) folded on the skin surface side based on a fold line located at the front-rear end edge of the extension portion. ), and have. In the stretched state of the waist band, the length in the front-rear direction of the skin contact portion is a, the length in the front-rear direction of the extension portion is b, and the length in the front-rear direction from the front-rear proximal end edge to the rear end edge of the disposable diaper is When the distance is c, a+b>；c is satisfied. [Selection diagram] Fig. 4【課題】前屈みの姿勢においてもウエストバンドの初期位置を維持し、臀部からの漏れを抑制できる使い捨ておむつを提供する。【解決手段】使い捨ておむつ(10)は、肌面側シート(20)と、ウエストバンド(80)と、を有する。ウエストバンドは、起立可能に構成された起立部(85)と、起立支点となる基端部と、を有する。基端部は、起立部と前後方向に隣接する前後基端部(84)と、起立部と幅方向に隣接する幅基端部(87)と、を有する。起立部は、前後基端縁から前後方向に延びる延出部(88)と、延出部の前後方向の端縁に位置する折り目を基点に肌面側に折り畳まれた肌当接部(89)と、を有する。ウエストバンドの伸長状態において、肌当接部の前後方向の長さをａとし、延出部の前後方向の長さをｂとし、前後基端縁から使い捨ておむつの後端縁までの前後方向の距離をｃとすると、ａ＋ｂ＞ｃを満たす。【選択図】図４
