VEHICLE DISPLAY DEVICE

A display device for a vehicle includes : a substrate housing portion (100) that stores a circuit substrate that outputs an image signal of an image to be displayed; an optical unit that is provided at one end of the substrate housing portion and that generates and projects an image based on the image signal output from the circuit substrate; and a combiner (400) that is provided at one end of the optical unit and on which the image is projected, wherein the optical unit has : an optical unit main body (210) that includes a light source and an image display element; and a projection unit (300) that is attached to the optical unit main body and that determines a projection direction, wherein the optical unit main body has a first main body surface and a second main body surface, which is a surface facing the first main body surface, and wherein the projection unit has two arrangement states: a first state where a projection port of the projection unit is on the side of the first main body surface; and a second state where the projection port is on the side of the second main body surface.