An electrical connector includes a shell, an insulating housing, a plurality of contacts and a pair of strengthening plates. The insulating housing is formed with a contact tongue plate. If the electrical connector is assembled, the contacts are inserted into the insulating housing. The strengthening plates are inserted in the contact tongue plate. The contact tongue plate with the contacts and the strengthening plates are received in the shell. The strengthening plates will improve the structure of the contact tongue plate of the electrical connector to resist an external force such as a pressing force of a mating connector. The strengthening plates can prevent the contact tongue plate of the electrical connector from deformation and damage.