The present invention provides a card connector. The card connector utilizes a base member and a cover member to form a card containing space, any one of two cards having different sizes is selectively contained in the card containing space. The card connector comprises a plurality of first contact elements and a plurality of second contact elements, a separating member used for vertically separating the card containing space and capable of moving in the card containing space corresponding to installation and dismounting of the two cards, and a popping member capable of moving in an anterior-posterior direction along a side wall; wherein the separating member comprises a plurality of protecting walls having containing recesses used for containing top ends of the plurality of first contact elements respectively; the popping member has a first abutting member used for abutting against one card and a second abutting member used for abutting against the other card, the second abutting member has a support face, when one card is installed, the support face is used for supporting the separating member.