To simplify a setup work when a cutting position of a material W is set and changed.

This cutting unit 10 is formed by mounting a screw shaft 21 and a guide shaft 22 parallel with each other, a screw member 11 corresponding to first and second drive shafts 23 and 24, a slider 12, an upper rotary blade 13 and a lower rotary blade 14 on a common supporting frame 16. The cutting unit 10 transversely moves along the guide shaft 22 via the slider 12 by rotating and driving the screw member 11 via a traveling motor 15 and the cutting position of the material W by the upper rotary blade 13 and the lower rotary blade 14 can be arbitrarily set.