A vehicle navigation system includes a movable display device having a display panel, a voice output device, a navigation screen determining portion, and a voice guidance control portion. The navigation screen determining portion determines whether a route guidance is being performed by displaying a navigation screen on the display panel when the part of the display panel is housed. When the navigation screen determining portion determines that the route guidance is being performed by displaying the navigation screen on the display panel, the voice guidance control portion controls the voice output device so that the voice output device performs the route guidance with a voice output.