A circuit interface device is presented. A circuit board is secured by a circuit board cover, a plurality of electrical contacts is disposed on the circuit board, and a connector cover is coupled to a front end of the circuit board, such that a socket disposed at one end of the connector cover is corresponding to an upper side of the electrical contacts of the circuit board, thereby forming a connector of the circuit interface device. As such, through a structural design of buckling the connector cover on the circuit board without completely covering the connector cover on outer edge of the circuit board, a thickness of the connector cover covering the circuit board cover is reduced.