A machine for chamfering the corner of an object comprising a rotating cutter arranged in a body, a slide guide pivoted slidably relative to the underside of the body and having guide planes perpendicular to each other and slidable along the corner of the object and also having a space which is formed between the guide planes and into which at least a part of cutting blades of the rotating cutter is projected, a stopper screw for connecting the slide guide and the body slidable to each other and serving to keep the cutting blades projected into the space by a predetermined distance, and a means for adjusting the cutting blades projected into the space.
