An electrical connector includes a plastic base, a metal housing, a plate-engaging element and a grounding element. A connection portion and terminals each having a pin portion extending out of the plastic base are disposed on the plastic base. The metal housing covers the plastic base while exposing the connection portion of the plastic base and the pin portions of the terminals. The plate-engaging element is formed with one elastic hook extending below the plastic base to engage with a connection hole of a circuit board. The grounding element contacting the metal housing is formed with a positioning piece extending below the plastic base and being positioned by a grounding hole of the circuit board. The plate-engaging element and the metal housing pertain to different parts. The plate-engaging element is formed with a fixing portion engaging with the plastic base.