A card connector which effectively prevents erroneous insertion of a card having a width smaller than a specified width has an introducing space formed between a body having contacts and a cover. An insertion preventing wall is formed in the body facing the upstream side in the card inserting direction. The cover includes a restricting plate projecting toward the introducing space, with the restricting plate being under a posture projecting further toward the introducing space on the downstream side in the card inserting direction. The restricting plate forms, at widthwise opposed ends thereof, contacting pieces which are deformed as coming into contact with widthwise opposed ends of a card, thereby lifting up the restricting plate.