To provide a drill support device that can reduce labor and time required typically in moving, fine-controlling and removing drills, and can improve the safety.

This drill support device 1 for supporting a drill S used for drilling up a surface M extending in an X-axis direction and a Y-axis direction comprises a mounting member 5 for supporting the drill S for movement in the X-axis direction, for movement in a Z-axis direction perpendicular to the drilling surface M and for rotation in θ directions or on the Z axis, and a guide part or guide rails 30 for supporting the mounting member 5 for movement in the Y-axis direction.