To enhance efficiency of an EMI processing by a method wherein an outermost layer is made as a seal ground layer, a non-insulating part is formed over a wide area as much as possible in part of a shield lower face, and the non-insulating part is connected to the other stable grounds through a wide contact area as much as possible.

An outermost layer is made as a seal ground layer 14, a non- insulating part 4 is provided in a wide area as much as possible in part of a shield face in a part close to both ends of a flexible cable 3, and a gasket 5 is pasted to the part. A flexible cable 3 equipped with the gasket 5 is pinched between a plating case body 1 and a case body 2 at an appropriate pressure, and the shield ground layer 14 of the flexible cable 3 is electrically connected to the stable ground plating case body 1 at a lower impedance. Thus, it is possible to intercept efficiently radiant noises generated from a clock signal, etc., passing a signal layer without using EMI counter-measure parts such as a ferrite core or the like.