A non-transitory storage medium storing an image transmission program that is executed on an in-vehicle device mounted in a vehicle having an illuminance detection unit configured to detect illuminance around the vehicle, an imaging unit configured to acquire an image of surroundings of the vehicle, and a communication unit configured to perform communication with an information center, the image transmission program includes: an image acquisition step of acquiring the image which the imaging unit acquires as an intersection image based on the illuminance which the illuminance detection unit detects at a position in front of the intersection by a predetermined distance; and a transmission step of causing the communication unit to transmit a data representing the intersection image to the information center.