PURPOSE: To efficiently perform deburring by automatically opening and closing the opening and closing lid of a barrel.

CONSTITUTION: A barrel 8 is rotatably provided in a case. To open and close the opening part 9 of the barrel 8, a deburring system is provided with an opening and closing lid 13 rotatably mounted on a rotating shaft 12 through energizing springs 17 in the normally closed direction and opening and closing-lid opening mechanisms 18 using cylinders or solenoids, etc., mounted in a housing case 4 at its both sides for moving the opening and closing lid 13 in the opening direction. In the lower part of the case is provided with a selector 24 for selecting burrs and a product; and a hopper 25 in the case for introducing the burrs or the product released from the opening of the barrel to the selector. The case is provided with an opening and closing cover for supplying the product to be removed its burrs in the barrel.