An electrical connector is mounted to a printed circuit board which has two buckling elements mounted thereon. The electrical connector includes an inner insulating housing, an outer insulating housing, a shell surrounding the inner insulating housing, and a plurality of conductive terminals. The outer insulating housing has an accommodating cavity for receiving the shell and the inner insulating housing. The outer insulating housing has a top wall. A top surface of the top wall defines a plurality of receiving passages. The outer insulating housing is mounted by the two buckling elements to make the electrical connector assembled under the printed circuit board with the top wall thereof abutting against the printed circuit board. Touching portions of the conductive terminals electrically contact the printed circuit board and are further pressed into the corresponding receiving passages by the printed circuit board.