PCB Laser Marking Vision System performs recognition inspection targeted at marking positions reserved for marking defective devices on PCBs by unit prior to molding work in the manufacturing processes of semiconductor substrates. The scratches, reject marks, and ID mapping information existing in and out of the units are identified to select materials to be marked. As this system is capable of automatically identifying marking positions measured in a few µm, there is no need for teaching the marking positions manually. Ultimately, the teaching time required for new devices are greatly reduced.