An electrical connector comprises a housing, a plurality of first terminals, a plurality of second terminals, a plurality of third terminals and a cage provided on the exterior of the housing. The housing comprises a base and a tongue. The base is provided with a base wall and an assembly slot provided on the base wall to which the mated tongue mates. The tongue is provided with a body and a plurality of terminal installation slots recessed downward at intervals from the top surface of the body, the rear end of the terminal installation slots being defined by a boss part. A yield notch is provided at each location where each terminal passageway corresponds to the boss part. Because the boss parts increase the strength of the tongue, and by utilizing the yield notches, the contacts are able to prevent the boss parts from entering the terminal installation slots.