A vehicle display device (1) includes a reflection-type hologram (2) disposed inside a windshield (101) of a vehicle (100), and a projection device (3) including an image display device (4) outputting a display light (10) and a regulating unit (5) configured to regulate a diffusion angle of the display light, and to project the display light (10) having passed through the regulating unit (5) onto the hologram (2). The hologram (2) outputs the display light (10) projected from the projection device (3) as diffracted light directed to an eye range (ER) of the vehicle (100), and the regulating unit (5) is configured to regulate the diffusion angle of the display light (10) to an upper limit angle (γ1) or less such that the display light (10u) reflected from the windshield (101) is directed in a direction different from the eye range (ER) .
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