A map display device includes a map data acquiring unit 21 for acquiring map data, an HOV lane determining unit 26 for determining whether or not HOV lane information showing that an HOV lane exists is included in link data defining roads included in the map data acquired by the map data acquiring unit, a display processing unit 28 for, when the HOV lane determining unit determines that HOV lane information is included in the link data, creating display data showing that a symbol showing an HOV lane is superimposed on a road formed by the link data including the HOV lane information, and a display unit 6 for displaying a map on the basis of the display data created by the display processing unit.