OPENING SHIELDING DEVICE

PROBLEM TO BE SOLVED: To provide an opening shielding device having a simple structure which enables to insert a blockage board through an opening of a conductive case so that a gasket may not break away and can prevent the leakage of electromagnetic waves through the opening by making a space between the opening and the blockage board in a conducting state. SOLUTION: In the opening shielding device, a pair of opening-side bent parts 1e which are bent at nearly 90 deg. inwardly from a pair of edges of an opening 1b formed in the conductive case 1, and a pair of blocking-side bent parts 7b formed by bending a pair of peripheral parts of a flat blocking section 7a of the blockage board 7 for blocking the opening 1b, are disposed adjacently to each other and opposite with each other when the blocking-side bent parts 7b are inserted into the opening 1b. The opening shielding device also comprises a contact preventive member 1f which is disposed more protuberantly than a surface where the gasket 2 constituted of conductive elastic members which are the opening-side parts 1e is bonded, and which prevents the contact of the blocking-side bent parts 7b with the surface where the gasket 2 is bonded.