To enable precise cutting of a workpiece without errors, without having to perform complicated work, even in the case of replacing a rotary blade in a cutting machine for cutting the workpiece, by moving the workpiece in a relative cutting direction of a holding means for holding the workpiece and a cutting means having the rotary blade, an indexing direction and a notching direction.

In the cutting machine, a marking member 40 for marking a position of the indexing direction of the rotary blade 24 is arranged at a required position of the machine. The position of the indexing direction of the blade 24 is marked on the member 40. Whether the blade 24 is disposed at a prescribed position is judged, based on the marking.