A card connector includes an insulating housing, a plurality of contacts, a projection and a detecting contact set. The insulating housing includes a bottom wall, a right wall and a left wall for defining a receiving space. The contacts are received in the insulating housing. The projection is protruded from the right wall and into the receiving space, which includes a slanting surface slanted relative to the right wall. The detecting contact set is fixed in the insulating housing, which includes a contacting arm protruding from the slating surface of the projection and into the receiving space. Due to the contacting arm of the detecting contact set is protruded from the slanting surface of the projection in the receiving space, the detecting contact set will be actuated while a card is inserted into the receiving space correctly and completely. Since, the detecting accuracy of the card connector is improved.