A socket coupled to an electronic device is provided. The socket includes a socket housing having a card containing space, a first tension rib, protruding in a direction of the card containing space in the socket housing, for supporting a first card contained in the card containing space, and a second tension rib, protruding in the direction of the card containing space in the socket housing, for supporting a second card having a size different from that of the first card contained in the card containing space. Accordingly, the electronic device may effectively utilize a space and may be slimmed down.