An exhaust gas treatment device for an exhaust system of an internal combustion engine, has a housing in which is arranged at least one ceramic body for exhaust gas treatment. To reduce the risk of damage for the ceramic body and/or the housing in the case of an inexpensive design, the ceramic body has a machined contact zone at least on its outlet end, and the housing has a bearing zone facing the ceramic body on its outlet end. The contact zone and the bearing zone cooperate with one another so that in the case of axial contact on the outlet end between the ceramic body and the housing, the ceramic body is in direct and axial contact with the housing in a line or over an area via the contact zone and the bearing zone, so that the contact is distributed in the circumferential direction or is continuous.