To provide a ruler for cutting in order to put a cutting line to an object to be cut when performing a cutting work of a member.

The ruler for cutting is composed of a metal fitting part 2 for putting a mark to the object to be cut, a ruler rod 3 capable of fixing the metal fitting part 2 while being moved and adjusted, and a projection 1 indicating the center of the mark. In the ruler for cutting, the metal fitting part 2 is previously matched at an effective width of the object 5 to be cut or at the deepest place for cutting, and the mark is put to the previously placed object 5 to be cut and the cutting line is put by abutting the projection 1 to the objecting shape 6 and by moving it in parallel.