A shift-by-wire device including a shaft position sensor that detects a shaft rotating angle, a drive unit that drives an actuator of the shaft, an operational function unit including an operational CPU that receives the shaft rotating angle from the shaft position sensor, receives a shift command from an administrative electronic control unit to transmit the shaft rotating angle of the shaft to the administrative electronic control unit, and controls the drive unit according to the shaft rotating angle and shift command. The device further includes a monitoring function unit including a monitoring CPU that receives the shaft rotating angle in order to monitor whether there is an abnormality in the operational function unit and transmits the shaft rotating angle to the administrative electronic control unit when a detected abnormality occurs in the operational function unit.