A shielding apparatus for an electric device comprises a first lead, a second lead and an inverted U-shaped cover, constituting a metallic inserting component. The first and second leads insert into two sides of the electric device, respectively, and electrically connect with a ground terminal of a circuit board. The inverted U-shaped cover contacts with the top of a metallic shell of the electric device and clips on the two sides of the metallic shell. Functionally, the metallic inserting component can reduce noises from electromagnetic interference, and tightly fix on the metallic shell without electrical welding so that the reliability of assembly will be improved.