An electrical card connector for receiving two electronic cards (7, 8) different in sizes and shapes comprises an insulating header (1), a plurality of electrical contacts (5) retained in the insulating header (1) and each having an engaging portion (51) for electrically connecting with an inserted card (7, 8), and a metallic shell (3) covering on the insulating header (1). The metallic shell (3) further has a top wall (31) providing at three elastic pieces (311, 312, 313). Wherein the width between a first and second elastic pieces (311, 312) accords with the width of a first card (7), and the width between the first and a third elastic pieces (311, 313) accords with the width of a second card (8).