To constantly cover a drilling drill by a cover without hindering the carrying-in/out of or marking fit to a material to increase safety.

A tubular fixed cover 17, for covering the vicinity of the main spindle end of a main spindle 4 in an elevated position, is provided on a cover supporting frame 20, to be fixed to the column 2 of an upright drilling machine 1. A tubular slide cover 18 being elevation free, wherein the upper part is fitted to the fixed cover 17, is provided, and in the lowered condition of the cover, a drilling drill 7 in the main spindle end is covered as far as the vicinity of the upper surface of a table 8. A cover elevating device 24, for elevatingly driving the slide cover 18, is provided on the cover supporting frame 20.