An electrical connector includes an insulative rectangular housing with a planar base defining opposite upper surface and lower surface thereon. Four restriction parts are formed at four corners of the base to cooperate with the base for commonly forming a receiving cavity to receive the electronic package therein. A plurality of first contacts are disposed in the base with corresponding contacting sections upwardly extending into the receiving cavity to upwardly abut against the corresponding pads on the undersurface of the electronic package. A plurality of second contacts are disposed in the base with corresponding contacting sections sidewardly extending into the receiving cavity to sidewardly abut against the corresponding pads on the side faces of the electronic package.