The invention relates to a tensioning device of a traction mechanism drive, having a tensioning lever mounted on a base housing and rotatable by a pivot bearing. A coil spring is arranged coaxially to the pivot bearing. The pivot bearing comprises a bearing journal, a bearing hub and at least one plain bearing sleeve which is arranged between the bearing journal and the bearing hub, and a central radial force application plane of the tensioning roller is axially spaced apart from a central radial bearing plane of the pivot bearing.