A muffler for an exhaust system of an internal combustion engine, comprising a muffler housing with a circumferential wall which extends longitudinally in the direction of a housing longitudinal axis and at least one base wall (14, 16) which is surrounded by the circumferential wall or/and retained on the circumferential wall separating two chambers (28, 30, 32) in the muffler housing and providing an intermediate wall, wherein at least one base wall opening (36, 38), which is surrounded by an opening edge region which is bent at an essentially plane base wall region of the base wall (14, 16) essentially in the direction of the housing longitudinal axis, and receives an exhaust pipe with a press fit, is provided in at least one base wall (14, 16), characterized in that - the opening edge region is designed so that is interrupted circumferentially about an opening centre axis of the base wall opening (36, 38), wherein the opening edge region comprises a plurality of opening edge region segments arranged spaced apart from another circumferentially about an opening centre axis of the base wall opening (36, 384) and wherein circumferential recesses are formed in the essentially plane base wall region between opening edge region segments succeeding each other in the circumferential direction, wherein the chambers (28, 30, 32) separated by the at least one base wall (14, 16) are in exhaust gas exchange communication via the circumferential recesses, - the opening edge region has a first edge section adjoining the essentially plane base wall region in a first bending region and a second edge section adjoining the first edge section in a second bending region, wherein a radial spacing of the first edge section from an opening centre axis of the base wall opening (34, 36, 38, 40) decreases in the direction from the first bending region to the second bending region, and - a radial spacing of the second edge section from the opening centre axis increases in the direction away from the second bending region. - the opening edge region is designed so that is interrupted circumferentially about an opening centre axis of the base wall opening (36, 38), wherein the opening edge region comprises a plurality of opening edge region segments arranged spaced apart from another circumferentially about an opening centre axis of the base wall opening (36, 384) and wherein circumferential recesses are formed in the essentially plane base wall region between opening edge region segments succeeding each other in the circumferential direction, wherein the chambers (28, 30, 32) separated by the at least one base wall (14, 16) are in exhaust gas exchange communication via the circumferential recesses, - the opening edge region has a first edge section adjoining the essentially plane base wall region in a first bending region and a second edge section adjoining the first edge section in a second bending region, wherein a radial spacing of the first edge section from an opening centre axis of the base wall opening (34, 36, 38, 40) decreases in the direction from the first bending region to the second bending region, and - a radial spacing of the second edge section from the opening centre axis increases in the direction away from the second bending region.