A vehicle door locking system (100) that includes communication means (12, 13) for communicating with an electronic key (30), unlocking means (33, 15) for unlocking doors when the electronic key is authenticated, and door locking means for locking the vehicle doors if the opening of any vehicle door is not detected within a predetermined time after the doors have been unlocked by the unlocking means, comprising electronic key detection means (35, 38) for sending a request signal to an interior of the vehicle to request the electronic key to communicate with the communication means when the first predetermined time has elapsed and the opening/closing detection means (16) has not detected the opening of any of the doors, wherein locking the doors by the door locking means (32, 15) is not performed if the electronic key detection means determines that the electronic key is in the vehicle interior.
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