An electrical connector (100) includes an insulating housing (30), a plurality of terminals (32) received in the insulating housing, an L-shaped metal shield (10), a base portion (20) and an ejector (40). The metal shield covers the insulating housing for defining a card receiving space. The base portion comprises a guide rail (21) and a cam plate (22) integral with the guide rail. A pair of arms (not labeled) extends upwardly from the cam plate to define a receiving channel (225) and the receiving channel defines a heart-shaped slot (220) at a front end thereof. The ejector is received in the receiving channel of the base portion and comprises a slider piece (41), a pin member (42) and a resilient element (43). The slider piece is being moveable to drive the pin member to move in the heart-shaped slot.