An unmanned air vehicle includes: a camera that takes an image in a vertical direction from the unmanned air vehicle; an image processor that indicates, on the image, a region in which the unmanned air vehicle is likely to crash and that detects an object of avoidance that is present in the region; a crash-avoidance flight controller that, in a case where the object of avoidance is detected, controls flight of the unmanned air vehicle so that the object of avoidance becomes undetectable in the region; and a crash probable region determiner that changes the region according to a result of the flight control.