A head-up display (10, 210, 310, 410) device comprising: an illumination unit (12, 212, 312, 412) that includes a light source (20, 320, 420), a fly eye lens (24, 224, 424), and a condenser (30, 230, 430), the fly eye lens including a first region (24a, 224a, 424a) configured to split an output light of the light source into a plurality of first illumination light beams and a second region (24b, 224b, 424b) configured to split the output light of the light source into a plurality of second illumination light beams, the condenser producing a first illumination light (56a, 256a, 456a) by superimposing the plurality of first illumination light beams output from the first region of the fly eye lens and producing a second illumination light (56b, 256b, 456b) by superimposing the plurality of second illumination light beams output from the second region of the fly eye lens; a display unit configured to produce a display light for the left eye by modulating the first illumination light and to produce a display light for the right eye by modulating the second illumination light; a concave mirror configured to project the display light for the left eye and the display light for the right eye toward a virtual image presentation plate to cause the display light for the left eye reflected by the virtual image presentation plate to travel toward a left region of an eye box and to cause the display light for the right eye to travel toward a right region of the eye box; an image processing unit (42, 342) configured to produce an image for the left eye by applying a first distortion correction process to an image for display and produces an image for the right eye by applying a second distortion correction process different from the first distortion correction process to the image for display; an illumination control unit (44, 344) configured to cause the illumination unit to generate the first illumination light and the second illumination light alternately; and a display control unit (46, 346) configured to cause the display unit to display the image for the left eye when the first illumination light is produced and causes the display unit to display the image for the right eye when the second illumination light is produced, wherein the first distortion correction process is asymmetrical in a horizontal direction such that an amount of distortion correction is maximum at the left end of the image for display, and the second distortion correction process is asymmetrical in the horizontal direction such that an amount of distortion correction is maximum at the right end of the image for display. an illumination unit (12, 212, 312, 412) that includes a light source (20, 320, 420), a fly eye lens (24, 224, 424), and a condenser (30, 230, 430), the fly eye lens including a first region (24a, 224a, 424a) configured to split an output light of the light source into a plurality of first illumination light beams and a second region (24b, 224b, 424b) configured to split the output light of the light source into a plurality of second illumination light beams, the condenser producing a first illumination light (56a, 256a, 456a) by superimposing the plurality of first illumination light beams output from the first region of the fly eye lens and producing a second illumination light (56b, 256b, 456b) by superimposing the plurality of second illumination light beams output from the second region of the fly eye lens; a display unit configured to produce a display light for the left eye by modulating the first illumination light and to produce a display light for the right eye by modulating the second illumination light; a concave mirror configured to project the display light for the left eye and the display light for the right eye toward a virtual image presentation plate to cause the display light for the left eye reflected by the virtual image presentation plate to travel toward a left region of an eye box and to cause the display light for the right eye to travel toward a right region of the eye box; an image processing unit (42, 342) configured to produce an image for the left eye by applying a first distortion correction process to an image for display and produces an image for the right eye by applying a second distortion correction process different from the first distortion correction process to the image for display; an illumination control unit (44, 344) configured to cause the illumination unit to generate the first illumination light and the second illumination light alternately; and a display control unit (46, 346) configured to cause the display unit to display the image for the left eye when the first illumination light is produced and causes the display unit to display the image for the right eye when the second illumination light is produced, wherein the first distortion correction process is asymmetrical in a horizontal direction such that an amount of distortion correction is maximum at the left end of the image for display, and the second distortion correction process is asymmetrical in the horizontal direction such that an amount of distortion correction is maximum at the right end of the image for display.