PURPOSE: To improve the production efficiency of a multilayered laminated board and, as the same time, to reduce the man power required for manufacturing the laminated board by continuously performing drilling, chamfering, and marking.

CONSTITUTION: A multilayered laminated board 1 which is roughly positioned in a roughly positioning process A is sent to a drilling process B. In the drilling process B, a guide mark is detected with X-rays and a guide hole, etc., are drilled on the basis of the guide mark. Then the drilled board 1 is sent to a defective product sorting process C for sorting defective products. When the board 1 is acceptable, the board 1 is sent to a chamfering process D for chamfering. After chamfering, the chamfered board 1 is sent to a marking process E for marking the board 1. Thus the drilling, chamfering, marking, etc., are continuously performed on one line.