A card connector includes an insulating housing, a plurality of conductive terminals integrally molded to the insulating housing, an ejection mechanism, a card tray slidably assembled to the insulating housing, and at least one restraining element restrained in one side of the card tray. The insulating housing includes a bottom wall, a first side wall, a second side wall, and a rear wall which defines a recess. The second side wall defines a sliding groove. A bottom surface of the sliding groove is concaved downward to form a heart-shaped tracking groove. The ejection mechanism includes a connecting element slidably disposed in the sliding groove, a push button, a guiding element slidably disposed in the sliding groove, a rotating element rotatably disposed in the recess and an elastic element. The push button is mounted to the connecting element and projects beyond a front surface of the insulating housing.