The invention relates to a hydraulic tensioning device for a traction mechanism drive, in particular for a chain or belt drive of an internal combustion engine, comprising a tensioning piston which is guided in a displaceable manner in a cylinder, a pressure chamber which is determined by the tensioning piston and the cylinder and which is used to receive hydraulic fluid, and a pressure-relief valve which defines the pressure in the pressure chamber. The pressure-relief valve (8) comprises, at least partially, a pre-mounted component which can be inserted or is inserted (10) into the tensioning piston (4).