A flight control device 10 is device for controlling an unmanned aircraft 20, including: a region detection unit 11 that detects a flight-restricted region 30 in which flight is restricted; a distance calculation unit 12 that calculates a distance d from the flight-restricted region 30 to the unmanned aircraft 20; and a collision determination unit 13 that specifies an altitude and a speed of the unmanned aircraft 20, and determines whether the unmanned aircraft 20 lands in the flight-restricted region 30 in case of a crash, based on the altitude and the speed that have been specified and the calculated distance d.