PURPOSE: To obtain simple structure without the possibility of overrun by forming a take-off/landing strip into plural concentrically circular infinite runways having inclination toward the center, disposing taxiways in concentric circles parallel to the runways, and connecting the taxiways and runways to a radial taxiway extended radially from a central apron.

CONSTITUTION: Main runways 1, 2 are formed to be circular, and the surface of the runways 1, 2 is to have inclination toward a central apron 5 so as to be prevented from sideslip caused by centrifugal force. Taxiways 34 are provided in the concentrically circular state, parallel to the runways 1, 2, and the taxiways 3, 4 and runways 1, 2 are connected to a radial taxiway 6 extended radially from the central apron 5. The main runways 1, 2 therefore have infinite length, so that overrun is prevented, and airport occupied area can be minimized, as well as the whole area can be controlled expediently.