PURPOSE: An actuator for a heat-retaining cover opening/closing apparatus is provided to offer stabilized operation ability of the actuator to the heat-retaining cover opening/closing apparatus, and to prevent the opening of a heat-retaining cover by the load.CONSTITUTION: An actuator for a heat-retaining cover opening/closing apparatus comprises the following: a reversible motor(10) including a driving shaft(12) with an extended end protruded to the rear side of a main body a deceleration unit(20) reducing the torque of the driving shaft of the reversible motor, and outputting the torque of the driving shaft using speed reduction shafts(21,22) a disk pad(41) fixed to the rear side of the reversible motor a lining(42) coupled to the driving shaft to rotate a clutch pad(43) installed on the rear side of the lining a magnet(44) installed on the rear side of the clutch pad a spring elastically supporting the clutch pad for closely attaching the lining to the disk pad and a release lever(45) rotatably installed on the rear side of the magnet.COPYRIGHT KIPO 2012본 발명은 보온덮개 개폐장치용 엑츄에이터에 관한 것으로, 더욱 상세하게는 드럼축의 정역 회전에 따른 와이어의 와인딩 또는 언와인딩에 의해 보온덮개를 견인하여 개폐하는 보온덮개 개폐장치에, 회전력을 제공하는 보온덮개 개폐장치용 엑츄에이터에 관한 것이다.