To uniformly remove burr on both sides of a surface of a workpiece by providing a horizontal moving means for horizontally moving a deburring means according to the vertical movement of a movable frame.

As a moving jig 51 advances, a cam follower 95 fitted to the moving jig 51 also advances. With the movement of the cam follower 95, the vertical movement of a movable frame 135 is caused through a copying plate holder according to the shape of a cam of a groove formed between copying plates. By the vertical movement of the movable frame 135, the vertical movement and the horizontal movement of the holder shaft 121 are performed, and finally the vertical movement and the horizontal movement of an endless sand paper 201 are performed. Thus, deburring is performed with the endless sand paper 201 pressed to both sides of a surface to be deburred of a workpiece 200 with designated pressure.