An electronic card connector includes a metal shell, a terminal block and a tray. The metal shell is provided on a circuit board and cooperates with the circuit board to define a slot having an entrance. The tray has an insertion end which first enters the slot of the metal shell and two receiving portions which are respectively parallel to two sides of the inserting-ejecting direction and respectively correspond to two limiting arms of the metal shell. The tray further has two interference oblique surfaces adjacent to the insertion end, when the tray is improperly inserted under a state that the tray is turned upside down, the two interference oblique surfaces respectively abut against the two limiting arms, therefore the tray cannot enter into the slot.