The invention relates to a tensioning device for bone cerclages, consisting of a guide part with a spindle located in the interior which receives a slide secured against rotation relative to the guide part, wherein the spindle is operatively connected to a rotary handle such that the slide is adjustable inside the guide part in the direction of the longitudinal axis of same, and further including means for the clamped attachment of the bone cerclage on the slide. According to the invention the means for clamping comprise a preferably two-part assembly group formed of an upper and a lower clamping piece, wherein the upper and the lower clamping pieces are connected to each other by a hinged joint so as to be foldable, and on the side opposite the hinged joint a clamping screw is provided to exert a force on the clamping pieces and fix the bone cerclage located between the clamping pieces in position, the surfaces of the clamping pieces pointing to the bone cerclage having clamping structures that permit the fixing of rope, wire and band bone cerclages in position.
