A card connector for receiving an electrical card therein includes an insulating housing, a plurality of electrical contacts, a plastic sheet, a shielding shell and a heat activated film. The insulating housing has a bottom wall, a rear wall and two side walls which together form an inserting chamber. The electrical contacts are fixed in the bottom wall of the insulating housing. The plastic sheet is pasted on a bottom of the insulating housing. The shielding shell covers on the insulating housing. The heat activated film is welded between the shielding shell and the rear wall and the side walls of the insulating housing.