VIRTUAL IMAGE DISPLAY DEVICE

A virtual image display device 10 presents a virtual image to a user via a virtual image presentation plate. The virtual image display device 10 includes a display unit 12 that generates an image display light L; a concave mirror 14 that reflects the image display light L and projects the image display light L toward the virtual image presentation plate; and a driving mechanism 20 that changes an orientation of the concave mirror 14 to change an incidence angle ϕ of the image display light L on the concave mirror 14 and change a distance a from the concave mirror 14 to the display unit 12 in accordance with the orientation of the concave mirror 14.