A shell muffler for an internal combustion engine that is formed of a first shell and at least one second shell, which shells are connected at their respective edge regions BS so as to form the shell muffler, each edge region BS having a box-like inner contour KSi, which has four corner regions (E1)-(E4) and a width (B) and a length (L), and an outer contour KSa, and each shell being produced from a shell blank R, which is formed by deforming a sheet metal strip using a deep drawing tool having the shape of the shell, the blank R, after deforming, having an edge region BR with an outer contour KR, said edge region being removed at least partially after the blank R has been cut to size so as to form the outer contour KSa of the edge region BS of the shell. In addition to the box-like basic shape G, the inner contour KSi of the edge region BS of the shell has at least one corner region (E1-E4) which is expanded beyond the width B and the length L of the box-like basic shape (G) and is thus adapted at least partially to the contour KR of the edge region BR to be cut of the blank R.