In a disposable diaper in a developed state where a front cover sheet and a rear cover sheet are separated from each other to be developed, as distance in a left-right direction from an absorbent body increases, a lower edge of the rear cover sheet goes away from an upper edge of the rear cover sheet and then goes toward the upper edge. A leg elastic member is bonded on the rear cover sheet along its lower edge, in left and right of the absorbent body. As above, the lower end portion of the rear cover sheet is convex downward in each of left and right of the absorbent body, and lower portions of hips of a wearer are wrapped with the lower end portions. It is therefore possible to suppress leakage of excrement from the lower portions of hips of the wearer.拋棄式尿布(1)中，在使前部外包裝片(41)及後部外包裝片(42)分離伸展的狀態下，後部外包裝片(42)之下邊緣(422)隨著從該吸收體(2)向該左右方向遠離，先朝向從該後部外包裝片(42)的該上邊緣(421)遠離的方向，之後再朝向靠近該上邊緣(421)的方向。另外腿部彈性構材(43)，在吸收體(2)的左右方向的兩側，沿著後部外包裝片(42)的下邊緣(422)而和後部外包裝片(42)接合。像這樣地，拋棄式尿布(1)中，在吸收體(2)的左右兩側，後部外包裝片(42)的下端部向下側凸出，利用該下端部將穿用者的臀部下部(以及靠近臀部和大腿部的交界線的部位)包進去，藉此能抑制排泄物從穿用者的後側下方漏出。
