To provide an on-board unit miniaturized and improved in operability and visibility of a user.

The on-board unit 1 is provided with: a display part 2; a casing 3; and a connection part 4 relatively movably connecting the display part to the casing 3; and is characterized in that the connection part 4 is constituted of: a first-directional slide part 5 supported by the casing 3 and slidable along the first direction; a second-directional slide part 6 supported by the first-directional slide part 5 and slidable along the second direction orthogonally to the first direction; and a rotational support part 7 supported by the second-directional slide part 6 and supporting the display part 2 rotationally around an axis orthogonal to the first direction and the second direction.

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