To provide an integral structure of an electromagnetic wave shield on a plurality of cable lead-ins with the grounding function of shield cables, this being difficult in the conventional frame structure and facilitate assembling and maintenance works whereas cables are mounted in many layers in the front and rear direction, thereby improving the mounting density.

Shield cables 5 are fixed by a pressure board 9 and screws 10 to a support metal 7 capable of supporting a plurality of shield cables to form a cable support assembly 12 and this is fixed to a ground plate 13 to ground it. The assembly 12 is structured to be removably mounted from above on the ground plate 13. The assembly 12 is electrically connected between the plate 13 and adjacent cable support assembly to form an electromagnetic wave shield structure and hence a grounding and electromagnetic wave shield structure at a cable lead-in support part.