An electrical connector for mating with a mating connector having a metal elastic sheet. The electrical connector includes an insulating body, a middle shielding sheet and a metal casing. The insulating body includes a base, a tongue extending forward from the base, and an upper row and a lower row of terminals. Each upper and lower row terminals has a contact portion exposed from upper and lower surfaces of the tongue respectively. The middle shielding sheet is disposed in the tongue and located between the upper row and lower row of terminals. The middle shielding sheet includes a groove exposed from a side of the tongue, for being buckled by the metal elastic sheet to stop forward displacement of the metal elastic sheet. The metal casing wraps a periphery of the insulation body to form a mating cavity, for the mating connector to be entered therein.