Keyless entry device

A keyless entry device including a portable remote control for transmitting an operation signal in response to the reception of an interrogating signal and an onboard control module that is mounted on a vehicle. The onboard control module includes an anti-theft unit in which an operational state is selectively set, a transceiver for transmitting the interrogating signal and receiving the operation signal, a signal verifier for generating a reception acknowledge signal when the signal verifier determines that the received signal is legal, a proximity detector for generating a proximity signal when the portable remote control approaches the vehicle, a sensor unit for generating an actuation signal when the sensor unit senses a physical change in the vehicle, a door lock detector for generating a door-locked signal when the door is locked, a door controller for locking and unlocking the door of the vehicle, and a controller for releasing the anti-theft unit when the door-locked signal, the proximity signal and the reception acknowledge signal are concurrently issued with the anti-theft unit in the set state, and for unlocking the door of the vehicle when the reception acknowledge signal and the sensor actuation signal are concurrently issued with the anti-theft unit in the release state.