Abstract: A navigation device which is mounted in a vehicle and in which the present location of the vehicle is presumed form the outputs from a direction sensor and movement distance sensor so that the presumed present location is displayed if it is coincident with a road map. In the navigation device, a present location presuming means is provided so that if there are a plurality of presumed present locations coincident with the road map, the locations are handled as actual present location candidates to serve as bases for the presumption of the present location of the vehicle until the propriety of the presumed present locations for actuality is negated by later presumption.