Disclosed is a grinder. The grinder according to an embodiment of the present invention comprises: a polishing plate for conducting a polishing operation for a workpiece by rotation; a dust-collecting cover including an upper surface cover for enveloping the upper surface of the polishing plate and a side surface cover for enveloping the circumference part of the polishing plate to prevent the diffusion of dust generated by the polishing operation; and a pressurizing unit for pressurizing a part of the polishing plate to conduct a polishing operation for a part of the workpiece.
