A display unit for use in a head-up display including an optical reflection unit to reflect light from a light source, the display unit comprising: a plurality of light sources arranged in a first direction; a plurality of first lenses disposed corresponding to the plurality of light sources in an emitting direction of the plurality of light sources, each of the plurality of first lenses having a first incidence surface and a first emitting surface, at least one of the first incidence surface and the first emitting surface being convex; a second lens disposed in an emitting direction of the plurality of first lenses, the second lens having a second incidence surface and a second emitting surface, at least one of the second incidence surface and the second emitting surface having a concave cross-section in the first direction, wherein each of the plurality of first lenses being configured so as to condense the light received from the corresponding one of the plurality of light sources onto the second lens; and a transmission type display device disposed in an emitting direction of the diffusing member that emits the light from the diffusing member, characterized by a diffusing member disposed in an emitting direction of the second lens, and in that the surface with the concave cross-section in the first direction of the second lens has only a single recess, such that the second lens transmits and refracts light emitted from plural convex first lenses on said single recess of the surface with the concave cross-section, and the configuration is such that the light emitted from the second lens has an outward emitting angle in the first direction which is monotonically increasing from the center of the second lens towards an end portion of the second lens along the first direction. a plurality of light sources arranged in a first direction; a plurality of first lenses disposed corresponding to the plurality of light sources in an emitting direction of the plurality of light sources, each of the plurality of first lenses having a first incidence surface and a first emitting surface, at least one of the first incidence surface and the first emitting surface being convex; a second lens disposed in an emitting direction of the plurality of first lenses, the second lens having a second incidence surface and a second emitting surface, at least one of the second incidence surface and the second emitting surface having a concave cross-section in the first direction, wherein each of the plurality of first lenses being configured so as to condense the light received from the corresponding one of the plurality of light sources onto the second lens; and a transmission type display device disposed in an emitting direction of the diffusing member that emits the light from the diffusing member, characterized by a diffusing member disposed in an emitting direction of the second lens, and in that the surface with the concave cross-section in the first direction of the second lens has only a single recess, such that the second lens transmits and refracts light emitted from plural convex first lenses on said single recess of the surface with the concave cross-section, and the configuration is such that the light emitted from the second lens has an outward emitting angle in the first direction which is monotonically increasing from the center of the second lens towards an end portion of the second lens along the first direction.