A map display device includes: a processor that defines a coordinate system on a map including element polygons showing constituent elements of an urban map; a processor that sets coordinates located inside the element polygons as inner coordinates and sets coordinates located outside the element polygons as outer coordinates; a processor that calculates, for each coordinate in the coordinate system, a moving average value; a processor that resets each of the outer coordinates which has the moving average value larger than a predetermined value as the inner coordinate; a processor that sets, as an urban polygon, a polygon along an outer periphery of a region formed of an aggregate of the set and reset inner coordinates; and a processor that enables the urban map to be displayed when a current location is present inside the urban polygon.