HEAD-UP DISPLAY DEVICE

A head-up display device that is to be mounted in a moving vehicle and enables an occupant in the moving vehicle to view a virtual image based on a reflected image of S-polarized light in a projection section, the head-up display device including: an image projector configured to apply projection light including S-polarized light; and the projection section on which the projection light is to be projected. The projection section includes laminated glass including a first glass plate defining a surface of the laminated glass on which the projection light is to be incident, a second glass plate defining a surface of the laminated glass from which the projection light is to be emitted, and a half-wave plate disposed between the first glass plate and the second glass plate. The first glass plate and the second glass plate each are formed from a glass composition containing silicon oxide, iron oxide, and an alkali metal oxide. At least one of the first glass plate or the second glass plate has a thickness of 0.3 mm to 3 mm, a total iron oxide content in terms of Fe2O3 in the glass composition of 0.2% by mass to 2.0% by mass, and a FeO content of 0.1% by mass to 0.5% by mass. The half-wave plate has visible light transmittivity and is configured to transmit light with an a* value of -2.5 to 4.5 and a b* value of -1.0 to 7.0 in a CIE color system. The reflected image is formed on a surface of the first glass plate which is to face an inside of the vehicle. The second glass plate is configured to emit from a surface thereof which is to face an outside of the vehicle the projection light converted to P-polarized light.