A disposable wearing article having a vertical direction, a lateral direction, a body facing surface and a non-body facing surface in a worn state, and comprising a front waist region, a back waist region and a crotch region extending between the front and back waist regions and including an absorbent structure for absorbing body fluids, wherein: the back waist region includes a back waist belt extending in the lateral direction and a pocket adapted for collecting body exudates, the pocket extending in the lateral direction and facing the back waist belt in a front-back direction at a middle in the lateral direction and openable downward; the pocket includes a pocket outer wall, a pocket inner wall facing the back waist belt and the pocket outer wall and lying therebetween, the back waist belt and the pocket inner wall are contiguous to each other at a contiguous lower edge of the back waist belt and the pocket inner wall, and the pocket inner wall and the pocket outer wall are contiguous to each other at a contiguous upper edge of the pocket inner wall and the pocket outer wall; the back waist region includes both first joining areas spaced apart from each other in the lateral direction and joining the back waist belt and the pocket inner wall to each other; the first joining areas include respective inside parts located on respective inner sides of any of respective imaginary lines extending upward along respective lateral side edges of the absorbent structure and respective outside parts located on the respective outer sides of the respective imaginary lines and the respective lateral side edges of the absorbent structure in the lateral direction; the back waist region further includes both second joining areas spaced apart from each other in the lateral direction and joining the pocket inner wall and the pocket outer wall to each other; the second joining areas include respective inside parts located on respective inner sides of any of respective imaginary lines extending upward along respective lateral side edges of the absorbent structure and respective outside parts located on the respective outer sides of the respective imaginary lines and the respective lateral side edges of the absorbent structure in the lateral direction; the outside parts (81c,82c) are located on both lateral side areas in the back waist region; and the first and second joining areas (81A,82A) extend continuously from the respective outside parts (81c,82c) to the respective inside parts (81b,82b). the back waist region includes a back waist belt extending in the lateral direction and a pocket adapted for collecting body exudates, the pocket extending in the lateral direction and facing the back waist belt in a front-back direction at a middle in the lateral direction and openable downward; the pocket includes a pocket outer wall, a pocket inner wall facing the back waist belt and the pocket outer wall and lying therebetween, the back waist belt and the pocket inner wall are contiguous to each other at a contiguous lower edge of the back waist belt and the pocket inner wall, and the pocket inner wall and the pocket outer wall are contiguous to each other at a contiguous upper edge of the pocket inner wall and the pocket outer wall; the back waist region includes both first joining areas spaced apart from each other in the lateral direction and joining the back waist belt and the pocket inner wall to each other; the first joining areas include respective inside parts located on respective inner sides of any of respective imaginary lines extending upward along respective lateral side edges of the absorbent structure and respective outside parts located on the respective outer sides of the respective imaginary lines and the respective lateral side edges of the absorbent structure in the lateral direction; the back waist region further includes both second joining areas spaced apart from each other in the lateral direction and joining the pocket inner wall and the pocket outer wall to each other; the second joining areas include respective inside parts located on respective inner sides of any of respective imaginary lines extending upward along respective lateral side edges of the absorbent structure and respective outside parts located on the respective outer sides of the respective imaginary lines and the respective lateral side edges of the absorbent structure in the lateral direction; the outside parts (81c,82c) are located on both lateral side areas in the back waist region; and the first and second joining areas (81A,82A) extend continuously from the respective outside parts (81c,82c) to the respective inside parts (81b,82b).