PURPOSE: To make it possible to fit a workpiece to a work table in one fixing process by placing a fixing means with tabs having through holes and guides in side faces on the workpiece composed of a plurality of print wiring boards and reinforcing plates layeed in order.

CONSTITUTION: A workpiece composed of a reinforcing plate 6-1, a print wiring boards 5-1, 5-2, 5-3, and 5-4, and a reinforcing plate 6-2 layered in order is placed on a specified position of a work table. This workpiece 1 is fixed a fixing means having guides 2-1, 2-2, 2-3, and 2-4 in cress and longitudinal directions which are provided with tabs 3 having through holes 4 on four(4) corners. Therefore, the workpiece composed of print wiring boards and reinforcing plates can be fixed in one fixingprocess without being pinned.