The present invention relates to a truck mixer having a chassis, a mixer subframe arranged on the chassis and a mixer drum which is arranged over a front drum support and a rear drum support on the mixer subframe, wherein at least the rear drum support is fastened on side members of the mixer subframe via elastic, shape-matched connections, wherein at least one of the connections for the fastening of the rear drum support to a side member of the mixer subframe has a connection arrangement for the shape-matched elastic connection which is arranged within the section width of the side member.