A vehicle display device , comprising: an image display configured to emit display light of an image ; an optical system configured to project the display light emitted from the image display onto a reflection face ahead of a driver ; and an adjustment part provided in an optical path of the display light from the image display to the reflection face (1 02a), wherein the image includes: a first region being an entire region visible to both eyes of the driver when the eyes are positioned at any point in an eye box (EB), the eye box (EB) being a range beforehand assumed as a range in which the position of the eyes moves; and a second region is a region, other than the first region , of the whole region of the image and that is closer to ends in an image width direction (GW) than the first region in the image is, the adjustment part is disposed at a position corresponding to a boundary between the first region and the second region , such that, when the eyes are positioned at the center of the eye box (EB), the adjustment part overlaps with the second region and not to overlap with the first region , wherein an end of the adjustment part being closer to the center of the image is positioned to correspond to a boundary line between the first region and second region , and the adjustment part is configured such that an amount of the display light penetrating the adjustment part is gradually reduced toward the ends in the image width direction (GW). an image display configured to emit display light of an image ; an optical system configured to project the display light emitted from the image display onto a reflection face ahead of a driver ; and an adjustment part provided in an optical path of the display light from the image display to the reflection face (1 02a), wherein the image includes: a first region being an entire region visible to both eyes of the driver when the eyes are positioned at any point in an eye box (EB), the eye box (EB) being a range beforehand assumed as a range in which the position of the eyes moves; and a second region is a region, other than the first region , of the whole region of the image and that is closer to ends in an image width direction (GW) than the first region in the image is, a first region being an entire region visible to both eyes of the driver when the eyes are positioned at any point in an eye box (EB), the eye box (EB) being a range beforehand assumed as a range in which the position of the eyes moves; and a second region is a region, other than the first region , of the whole region of the image and that is closer to ends in an image width direction (GW) than the first region in the image is, the adjustment part is disposed at a position corresponding to a boundary between the first region and the second region , such that, when the eyes are positioned at the center of the eye box (EB), the adjustment part overlaps with the second region and not to overlap with the first region , wherein an end of the adjustment part being closer to the center of the image is positioned to correspond to a boundary line between the first region and second region , and the adjustment part is configured such that an amount of the display light penetrating the adjustment part is gradually reduced toward the ends in the image width direction (GW). <EOS>