A card connector includes a housing having terminal members into which a card is inserted. The card connector also includes a card insertion space, defined by a top plate, a bottom plate and two side plates, the opposing plates mutually facing each other. The side plates linking the edges of the top and bottom plates. The card insertion space also has a front and a rear edge opening in which the front and rear edges of the card are exposed. The card connector also includes connection terminals, integrated with and mounted in the housing and in contact with the terminal members. One of the side plates has a card retaining member, engaged with a first concave member formed on the side edge of the card, and a position-determining member, engaged with a second concave member formed on the side edge of the card to determine the position of the card.