An electrical connector includes an outer shell formed by metal-injection mold and a terminal module including a base and a mating tongue extending forwardly from the base and loaded with a plurality of terminals, and a waterproof glue. The shell includes a seat and a sidewall extending forwardly from the seat, the seat defines a front opening and a receiving cavity. The base is received in the receiving cavity and the mating tongue extends across the front opening and located in the mating cavity. The seat defines a pouring hole from an outer face thereof and communicating with the receiving cavity, the glue is filled with gap between the terminal module and the outer shell via the pouring hole.