PURPOSE: To increase the accuracy of execution by forming a laser oscillator, a light distributor furnishing plural output terminals, optical fibers, condenser lenses, and a model frame corresponding to the designated surface where the marking positions are set beforehand.

CONSTITUTION: A model frame 12 in which the marking positions corresponding to the punching positions in a facing surface are set is erected on a frame 3 which can be moved freely. Then, condenser lenses D1...Dn are provided inside a holder 14, and installed to the positions set in the frame 12 through a leveling mechanism, to radiate laser beams LB1...LBn in the parallel condition. Then, the laser beams are oscillated by a laser oscillator A, and radiated from the condenser lenses D1...Dn through a distributor C to the designated surface 10. As a result, the laser beams projected on the designated surface 10 is corresponding to the marking positions, and the accuracy of execution can be increased.