A circuit board module for being assembled to a case is provided. The circuit board module includes an electronic connector and a circuit board. The electronic connector is fixed to the circuit board. The circuit board has at least one first slot. The at least one first slot is configured for a fixing element to pass through and for the circuit board to be assembled to a case. The size of the at least one first slot allows the fixing element to move in a direction parallel to a surface of the circuit board in the at least one first slot. An electronic device having the circuit board module is also provided.