Head-up display device

A head-up display device that displays a virtual image within a virtual image display area by projecting display light onto a projected member, comprising:

• a display unit that emits the display light;
• a mirror including a reflective surface that reflects the display light toward the projected member;
• and
• a drive mechanism that rotates the mirror between a plurality of rotation positions around a rotational axis so as to change an irradiation position of the display light on the projected member, wherein:
• a light ray, of the display light, corresponding to a center position of the virtual image display area passes through display image center positions within display light reflection areas that reflect the display light on the reflective surface;
• and
• when the mirror is in each of the rotation positions, a deviation amount of the display light reflection areas is set to be smaller than a positional deviation amount of the display image center positions.