An absorbent article having a longitudinal direction (L), a lateral direction (W), and a thickness direction (T) that are orthogonal to each other, and including a stomach-side portion including a stomach-side sheet member, a back-side portion including a back-side sheet member, and a joining portion in which at least one end portion of the stomach-side portion and at least one end portion of the back-side portion in the lateral direction (W) are joined to each other in a state of being overlapped in the thickness direction (T) along the longitudinal direction (L), wherein the joining portion includes a plurality of fused portions which are separated from each other and disposed along the longitudinal direction (L), each of the plurality of fused portions includes a core portion (MC) in which the stomach-side sheet member and the back-side sheet member are fused to each other in the thickness direction (T), and a peripheral wall portion (SW) in which the stomach-side sheet member and the back-side sheet member are fused to each other in the thickness direction (T) to extend in a tubular shape in the thickness direction (T) from a peripheral edge of the core portion (MC), a surface of the core portion (MC) is flat, in a peeling test of the joining portion in which one end portion of a sample (SA) including the joining portion in the longitudinal direction (L) is held by two jigs , and while peeling off the joining portion to widen a distance between the two jigs, a load (F) to be applied between the two jigs is measured, a graph showing the load (F) with respect to the distance (D) has a plurality of protruding portions (K k ) in which the load temporarily shows local maximum values (F Mk ) at respective positions of the plurality of fused portions , and in the peeling test, when the one end portion of the sample (SA) in the longitudinal direction (L) is an end portion of either a waist opening (WO) side or a leg opening (LO) side of the absorbent article, a standard deviation with respect to an average value of the local maximum values (F Mk ) in the plurality of the protruding portions (K k ) corresponding to the plurality of fused portions is 3 N or less, measured as described in the description. wherein the joining portion includes a plurality of fused portions which are separated from each other and disposed along the longitudinal direction (L), each of the plurality of fused portions includes a core portion (MC) in which the stomach-side sheet member and the back-side sheet member are fused to each other in the thickness direction (T), and a peripheral wall portion (SW) in which the stomach-side sheet member and the back-side sheet member are fused to each other in the thickness direction (T) to extend in a tubular shape in the thickness direction (T) from a peripheral edge of the core portion (MC), a surface of the core portion (MC) is flat, in a peeling test of the joining portion in which one end portion of a sample (SA) including the joining portion in the longitudinal direction (L) is held by two jigs , and while peeling off the joining portion to widen a distance between the two jigs, a load (F) to be applied between the two jigs is measured, a graph showing the load (F) with respect to the distance (D) has a plurality of protruding portions (K k ) in which the load temporarily shows local maximum values (F Mk ) at respective positions of the plurality of fused portions , and in the peeling test, when the one end portion of the sample (SA) in the longitudinal direction (L) is an end portion of either a waist opening (WO) side or a leg opening (LO) side of the absorbent article, a standard deviation with respect to an average value of the local maximum values (F Mk ) in the plurality of the protruding portions (K k ) corresponding to the plurality of fused portions is 3 N or less, measured as described in the description. <EOS>