A circuit device includes a circuit board having several contacts disposed on a first face of the circuit board and a connector disposed on a second face of the circuit board. The circuit board includes a hollow part, and the hollow part is defined through the circuit board from the first face of the circuit board to the second face of the circuit board. The circuit device includes several cables. One of two ends of each cable is on the first face of the circuit board and is connected to the corresponding contact, and the other end of each cable passes through the hollow part of the circuit board to the second face of the circuit board and extends outwardly.