The present invention provides a head-up display apparatus capable of both long-distance display and short-distance display. A functional film 51 is mounted on a glare trap part 50 of a head-up display apparatus 1. In order to display a first virtual image 9a, a first image display device 30a projects a first image onto a windshield 3 via the glare trap part. In order to display a second virtual image 9b having a different display distance, a second image display device 30b generates a second image on the functional film and projects the second image onto the windshield. For the functional film 51, a variable transmittance film having a light transmittance that varies according to the applied voltage or a transparent self-luminous film in which an irradiated portion emits light when irradiated with a laser beam of a specific wavelength is used.