In a navigation apparatus having a cradle unit that is fastenable to a vehicle and is equipped with at least a microcomputer; and a front panel unit that is attachable to and detachable from the cradle unit and is equipped with at least a display displaying map data and a microcomputer performing a navigation function to indicate a determined location of the vehicle on the map data, it is configured such that a panel is integrally formed at bottom of the cradle unit to be attachable to the vehicle. With this, it becomes possible to provide the navigation apparatus configured such that a member having a microcomputer performing a navigation function is attachable/detachable to/from the main body, i.e., the base unit, thereby improving ease of use, that the member can be easily attached to the dashboard of the vehicle, and that unnatural impression is prevented from arising in the appearance.