A vehicle display device includes: an optical system that makes display light emitted from an emission unit cross along an intersecting direction intersecting with an optical axis direction of the display light, and then reflects the display light on a display surface provided to a vehicle toward an eye point that is assumed in advance; a light-blocking wall provided to face an optical path of the display light and including a narrowing part that narrows the optical path toward a cross point of the display light along the intersecting direction; and a partial cutoff adjustment structure that partially cuts off a display image by the display light at a portion other than the narrowing part when the eye point moves along the intersecting direction.