An electrical connector including an insulative housing (10) comprising a longitudinal base (110), a pair of shoulder portions (130) respectively projecting forwards from two opposite end sections of the longitudinal base, and a tongue plate (120) projecting forwards from a middle section of the longitudinal base and located between the pair of shoulder portions; a plurality of terminals (30) arranged on the tongue plate; and a shell (20) provided with a rectangle frame surrounding the tongue plate and defining a mating opening therein for accommodating a mating portion of a mating connector, the rectangle frame fitly set between the shoulder portions.