Object: A drill dust collector is provided that is capable of drilling holes in an area ranging from a position near a corner to a position distant from the corner and that can be positioned with a side face in contact with an upright face such as a wall during drilling. Means for Solving: The drill dust collector has (i) an opening 2C provided in the upper face of a box having an open lower face 1C, for receiving a drill inserted therein; (ii) a suction port 1 U connected to the leading end of a suction hose 3 connected to an suction apparatus; and (iii) a contact member 1 A of high flexibility formed so as to extend around the lower face of the box. The box has a lid member 3 composed of the opening 2C and its peripheral part, and a box body 1. The lid member 3 is placed so as to be rotatable relative to the box body 1 and the opening 2C is located at a position the center of which is shifted from the center of rotation of the lid member 3 relative to the box body 1.