PURPOSE: To provide an aircraft landing aid device by which an aircraft lands on a runway regardless of the weather at a very small investment.

CONSTITUTION: A database 1, a sensor 2, and a navigation means 3 are connected to a correlation means 4. A vertical azimuth and a horizontal azimuth of the aircraft whose position is picked up by the sensor are calculated through the maximized correlation and the intelligence of the configuration of the sensor 2. The database 1, the navigation means 3 and the correlation means 4 are connected to a means 5 deciding an accurate position of the aircraft. The accurate geographical position of the aircraft is decided through the intelligence of azimuth as to some objects whose symbol and position are stored in the database 1.