PROBLEM TO BE SOLVED: To provide an on-board device that can be mounted to a room mirror and preferably inhibits obstruction to opening/closing of a sun visor.SOLUTION: A navigation device 1 includes: a body part 2; a mount part 3; and a spring 23. The mount part 3 mounts the navigation device 1 to the room mirror 12 installed in a vehicle. The body part 2 is supported by the mount part 3 so as to be movable in a direction parallel to a mirror surface of the room mirror 12. The spring 23 stably positions the body part 2 so that centers in a longitudinal direction of the body part 2 and the mount part 3 are matched.SELECTED DRAWING: Figure 4
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