A card connector includes an insulating housing (1), a number of contacts (2) and a shell (4). The insulating housing (1) defines a card receiving space (15) with a card insertion direction and comprises an engaging portion (114, 102). The contacts (2) are retained in the insulating housing (1) and exposed into the card receiving space (15). The shell (4) covered the insulating housing (1) comprises a resilient piece (411, 421) corresponding to the engaging portion (114, 102) of the insulating housing (1). The resilient piece (411, 421) of the shell (4) engages with the engaging portion (114, 102) of the insulating housing to urge the resilient piece to slightly distort elastically after the shell (4) is assembled to the insulating housing (1).