There are provided a contact structure for a card connector (100). The contact structure includes a plurality of contacts (2) which are arranged in parallel with one another. Among the plurality of contacts, there is a detect contact (22) which is the longest contact and disposed at one of the farthest ends of the card connector, a power contact (24) at substantially center portion thereof, a ground contact (25) adjacent to the power contact. Other contacts are the signal contacts (21) for communicating signal. A connect contact, which is integrally formed with the power contact and transversely extends toward to the detect contact, is designed for connecting the detect contact and the power contact. The detect contact, the power contact and the connect contact cooperate to form a detect switch.