Head-up display device

A head-up display device comprising:

• a display that emits a display light corresponding to a display image, the head-up display device allowing a driver to visually recognize a virtual image displayed in front of a display member depending on the display image in a driver's visible area in a vehicle by projecting the display image displayed on the display onto the display member through an optical system of the vehicle, wherein
• the display has a transmission type liquid-crystal display element, and a backlight unit that illuminates the liquid-crystal display element from a back side thereof,
• the backlight unit has a single light source, an optical condenser that condenses light emitted from the light source toward the liquid-crystal display element, and an optical member arranged in an optical path between the optical condenser and the liquid-crystal display element to diffuse the light condensed by the optical condenser,
• the optical member has a light emission face arranged in a position optically conjugated with the visible area to emit the light incident from the optical condenser, and the light emission face has a center axis, and
• the optical condenser is asymmetric with respect to the center axis such that illuminance distribution of light emitted from the light emission face varies in a vertical direction of the light emission face in order to provide a constant luminance distribution in the vertical direction of the visible area, and has a single lens face which is a convex free curved surface.