A head-up display that is adapted to be used on a vehicle, projects an image on a transparent reflective member and allows an observer to visually recognize a virtual image, the head-up display comprising: a display device that displays the image; and a projection optical system that projects the image displayed on the display device to a viewpoint of the observer, wherein the projection optical system includes a refractive optical system (121, 123) that includes at least one optical element (121, 123), and a concave mirror having a concave reflection surface, the refractive optical system (121, 123) is positioned on an optical path (Lc) between the display device and the concave mirror, the refractive optical system (121, 123) includes a lens element having negative power as a whole, the lens element having negative power has an incident surface into which light of the image displayed on the display device is incident, the incident surface has a concave surface, characterized in that the power of the lens element is stronger in the right/left direction of the vehicle than in the upper/lower direction of the vehicle, and a following condition is satisfied: 0.5 < H / L < 10.0 where H represents a length from reference outer side image end (Do) to reference inner side image end (Di), and L represents an optical path length of a reference beam from the display device to the incident surface of the lens element having negative power in the refractive optical system (121, 123). a display device that displays the image; and a projection optical system that projects the image displayed on the display device to a viewpoint of the observer, wherein the projection optical system includes a refractive optical system (121, 123) that includes at least one optical element (121, 123), and a concave mirror having a concave reflection surface, a refractive optical system (121, 123) that includes at least one optical element (121, 123), and a concave mirror having a concave reflection surface, the refractive optical system (121, 123) is positioned on an optical path (Lc) between the display device and the concave mirror, the refractive optical system (121, 123) includes a lens element having negative power as a whole, the lens element having negative power has an incident surface into which light of the image displayed on the display device is incident, the incident surface has a concave surface, characterized in that the power of the lens element is stronger in the right/left direction of the vehicle than in the upper/lower direction of the vehicle, and a following condition is satisfied: 0.5 < H / L < 10.0 where H represents a length from reference outer side image end (Do) to reference inner side image end (Di), and L represents an optical path length of a reference beam from the display device to the incident surface of the lens element having negative power in the refractive optical system (121, 123). H represents a length from reference outer side image end (Do) to reference inner side image end (Di), and L represents an optical path length of a reference beam from the display device to the incident surface of the lens element having negative power in the refractive optical system (121, 123).