Wrongful authentication process is prevented. A passive entry
authenticating section compares an identification signal sent from a
portable unit with an identification signal previously stored in a
storage section. A biometrics authenticating section compares the
biometrics information of a user inputted through a sensor section with
the biometrics information registered in a biometrics database. A control
section authenticates an authorized user when there is agreement in both
the identification-signal comparison result and the
biometrics-information comparison result, and controls a lock system to
unlock the door lock of the automobile.