A latching mechanism for holding an electronic card on a printed circuit board, includes an insulative fixing device mounted to the printed circuit board and a metallic latching device attached to the fixing device. The fixing device provides the positioning post extending through the positioning hole of the electronic card and the latching device provides a hook section downwardly pressing the electronic card so as to have the electronic card in a parallel relation with the printed circuit board. A card edge connector is provided on the printed circuit board for cooperatively holding the electronic card thereon.