Abstract: A strain reliever for a lead of an implantable heart stimulator, the lead including at least one cable having an electric conductor, has a body of electrically conducting material in electric contact with the electric conductor. The body is lockable in a position in electric contact with electric circuitry of the heart stimulator. The body has a fastening arrangement for fastening the proximal end of the cable at the fastening point on the peripheral surface of the body located at a distance from the distal end of the body. A fixing arrangement is provided at the distal end of the body for fixing the cable to extend in the distal direction from a departure point at the body distal end. The cable is intended to extend in a helical path on the peripheral surface of the body between the fastening point and the departure point.