Head-up display

A head-up display for projecting a virtual image onto a display medium, the head-up display comprising:

• an image generator that emits display light that forms a display image;
• a mirror that forms a virtual image on a side opposite to an observer relative to the display medium by guiding, to the display medium, the display light emitted from the image generator;
• and
• a housing that houses the image generator and the mirror,
• wherein the mirror includes:
• a base that is elongated and includes a first surface and a second surface, the first surface including a reflective surface that guides the display light to the display medium, the second surface being a rear surface of the first surface;
• and
• a raised wall that extends upward from a terminal edge of the second surface and extends in a longitudinal direction of the base, and
• a center portion of the raised wall in the longitudinal direction is lower than each of both end portions of the raised wall in the longitudinal direction.