To provide a cutting machine capable of improving its machining accuracy while inhibiting the degradation of machining efficiency, and to provide a bush of the cutting machine.

The bush 20 is mounted at the lower end of a pressure foot 15 of a printed board drilling machine 1. The bush 20 includes a lower end face 23 for thrusting an entry board 41 around a machining position, and a lower end face 26 formed on the further outer periphery side and the further upward side than the lower end face 23 and having a jet hole 25 from which compressed air is jetted. The bush 20 also includes a fourth cylindrical part for guiding the compressed air jetted from the jet hole 25 to the entry board 41. The fourth cylindrical part is formed of a material whose surface shape is deformed along the surface of the entry board 41 when its lower end face 32 abuts on the entry board 41.