To provide a cutter for a plate material or the like wherein a structure is simple and a manufacturing cost can be decreased.

A clamping means 30 corresponding to a table 2 is provided and the plate material W is fixed to a surface of the table by pressing with the clamping means 30. Two knife edges of a stationary knife edge 16a on one side cutting in from a rear surface side of the plate material W by being projected on the table 2 and a stationary knife edge 16b on the other side cutting in from a front surface side are equipped to a cutting unit 12 provided inside the table 2. Cut working of the plate material W is carried out by travel transferring the cutting unit 12.