An electrical card connector assembly includes an electrical card connector and a printed circuit board. The electrical card connector includes: a first contact module and a second contact module assembled to the printed circuit board along a transverse direction perpendicular to a card-inserting direction; a shielding shell enclosing the contact modules to form a receiving room; a tray movably received in the receiving room along the insertion direction and having a first receiving groove receiving a first card corresponding to the first contact module and a second receiving groove receiving a second card corresponding to the second contact module; an ejector comprising a lever located at a lateral side of the first contact module and a cam located at a rear of the first contact module; and a detecting terminal positioned at a rear of the second contact module beside the cam along the transverse direction.