To irradiate an upper surface of a cutting material with laser radiation irradiated from a laser oscillator, even when the upper surface of the cutting material is directed to an opposite side of the laser oscillator.

A supporting member 32 is fixed to a holder 5. The laser oscillator 30 is provided to be horizontally movable in a front and rear direction on the supporting member 32. When a cutting blade part 8 is located at an upper limit position, a part or all of laser radiation L passes a lower side of a cutting blade 10. The upper surface of the cutting material 41 is irradiated with the laser radiation L without being hindered by the cutting blade 10 or being in the shadow of the cutting material 41.