| 摘要 |
<p>A transmitting antenna 21 to transmit a request signal in a vehicle compartment is disposed off the center line of the vehicle compartment in a vehicle width direction. The output strength of the request signal transmitted by the transmitting antenna 21 is switched in such a manner that a receivable output range of the request signal by a portable device 3 reaches one of both doors 10a, 10b which is equipped with one of access switches 1a, 1b which has been operated. Accordingly, it can be properly recognized whether the portable device is located inside the vehicle compartment or outside the vehicle compartment even if the transmitter to transmit the request signal in the vehicle compartment is disposed off the center line of the vehicle compartment in the vehicle width direction.
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