In a rain shelter control system for vehicular doorways, an electronic key ECU causes exterior signal transmitters to periodically transmit request signals. When a portable device receives the request signal in an arrival range of the request signals, the portable device generates a response signal responsive to the request signal. When a receiver receives the response signal from the portable device, the electronic key ECU operates to automatically open any of rain shelters near the portable device, so that a holder of the portable device and passengers fold their umbrellas under the opened rain shelters, so that they can get into a vehicle without being exposed to rain. Besides, the electronic key ECU operates to automatically open the rain shelter when they get off the vehicle.