To provide a "navigation device" for informing a center of a part where road map data is to be updated without transmitting the coordinate data of the absolute coordinate (longitude/latitude coordinate).

When travel of one's own vehicle outside roads included in the map data is detected, this navigation device creates notification information of map data fault, and transmits the created notification information of the map data fault to a predetermined management server being managing the map data via a radio communication device 6. Here, as the map data fault information (c), a guide image 300 is used where a current position mark 302 showing the current position is drawn on a map image 301 that is displayed (b) on a display 3 at the time point and shows a map around the current position.

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