An absorbent article having a longitudinal direction, a lateral direction intersecting the longitudinal direction, and a front-back direction intersecting the longitudinal direction and the lateral direction, the absorbent article comprising: a front waist portion extending along the lateral direction; a back waist portion extending along the lateral direction; and a crotch portion provided between the front waist portion and the back waist portion, the front waist portion and the back waist portion each including an elastic region (X, Y) extending along the lateral direction, a one-side end portion of the back waist portion on a one side in the lateral direction being joined by a first joining portion to a one-side end portion of the front waist portion on the one side in the lateral direction, an other-side end portion of the back waist portion on an other side in the lateral direction being joined by a second joining portion to a fastening member, the fastening member having a fastening portion being capable of being fastened to the front waist portion when putting on the absorbent article, while the front waist portion and the back waist portion being stretched in the lateral direction, a lateral distance of the front waist portion from a lateral center of the crotch portion to an other-side end of the front waist portion is smaller than a lateral distance of the back waist portion from the lateral center of the crotch portion to an other-side end of the back waist portion, wherein the elastic region of the back waist portion is arranged in the other-side end portion of the back waist portion on the other side in the lateral direction, and while the fastening portion being fastened to the front waist portion so that an end of the fastening portion on a side closer to the second joining portion is positioned in the lateral direction on an end of the crotch portion opposite to the first joining portion, the elastic region arranged in the other-side end portion of the back waist portion is located on the non-skin side of an other-side end portion of the front waist portion on an other side in the lateral direction, and the elastic region arranged in the other-side end portion of the back waist portion has a stacking part in which the elastic region is stacked on the other-side end portion of the front waist portion, and the other-side end portion of the front waist portion does not have stretchability. a front waist portion extending along the lateral direction; a back waist portion extending along the lateral direction; and a crotch portion provided between the front waist portion and the back waist portion, the front waist portion and the back waist portion each including an elastic region (X, Y) extending along the lateral direction, a one-side end portion of the back waist portion on a one side in the lateral direction being joined by a first joining portion to a one-side end portion of the front waist portion on the one side in the lateral direction, an other-side end portion of the back waist portion on an other side in the lateral direction being joined by a second joining portion to a fastening member, the fastening member having a fastening portion being capable of being fastened to the front waist portion when putting on the absorbent article, while the front waist portion and the back waist portion being stretched in the lateral direction, a lateral distance of the front waist portion from a lateral center of the crotch portion to an other-side end of the front waist portion is smaller than a lateral distance of the back waist portion from the lateral center of the crotch portion to an other-side end of the back waist portion, wherein the elastic region of the back waist portion is arranged in the other-side end portion of the back waist portion on the other side in the lateral direction, and while the fastening portion being fastened to the front waist portion so that an end of the fastening portion on a side closer to the second joining portion is positioned in the lateral direction on an end of the crotch portion opposite to the first joining portion, the elastic region arranged in the other-side end portion of the back waist portion is located on the non-skin side of an other-side end portion of the front waist portion on an other side in the lateral direction, and the elastic region arranged in the other-side end portion of the back waist portion has a stacking part in which the elastic region is stacked on the other-side end portion of the front waist portion, and the other-side end portion of the front waist portion does not have stretchability. the elastic region arranged in the other-side end portion of the back waist portion is located on the non-skin side of an other-side end portion of the front waist portion on an other side in the lateral direction, and the elastic region arranged in the other-side end portion of the back waist portion has a stacking part in which the elastic region is stacked on the other-side end portion of the front waist portion, and the other-side end portion of the front waist portion does not have stretchability.