To shorten processing time by eliminating an uncut section before processing and by eliminating waste time in a processing device for drilling a hole.

Processing for drilling a hole Q is carried out by using the device provided with a heeding actuator M1 used to progress.regress a processing head 15 on which a drill 16 is mounted, a rotating actuator M3 used to rotate the drill 16, a collision detecting portion 10C used to detect the collision of the drill 16 with a work W, by driving the feeding actuator M1 and the rotating actuator M3, by detecting the collision of the drill 16 made to lessen thrust force while keeping a quick feeding velocity with the work W via the collision detecting portion 10C, and by forcing cutting-in into the work W by switching the drill 16 to the feeding velocity of cutting and by progressing with the thrust force of the normal cutting processing.