A vehicle-mounted device includes a collector that collects sensor data detected by a sensor with which a vehicle is equipped, a transmitter that sends the sensor data collected by the collector to an external device, a buffer unit that buffers data sent by the collector, a determination unit that determines whether or not a predetermined condition is satisfied, and a controller that controls the sending of the sensor data by the transmitter by the external device. The controller causes the transmitter to stop sending sensor data collected by the collector to the external device when the determination unit determines that the predetermined condition is met, and causes when a determination result obtained by the determination unit changes to indicate that the predetermined condition is not met, after the determining unit determines that the predetermined condition is met, the transmitter simultaneously sends the sensor data stored in the buffer unit to the external device while giving priority to the sensor data with a shorter delay time based on priority -Levels according to the delay times. The delay times all represent a difference between a time when the sensor data was recorded and a current time.
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