Display device and head-up display device

The invention provides a display device and a head-up display device capable of improving the display quality of a display image. A display device (10) is provided with: a light source (19) that emits light; a display unit (13) that displays a display image on the basis of the light from the light source (19); a collimator lens (17) that sets the light from the light source (19) as parallel light; and a light distribution lens (20) that distributes the parallel light to the display unit (13). The light distribution lens (20) is provided with a plurality of lens breaking sections (21a-21n) arranged in the Y direction and arranged in a stepped shape so as to be offset from each other in position in the Z direction. The incident surfaces (21I) of the plurality of lens breaking sections (21a-21n) are formed so as to face the same direction with respect to the incident parallel light. 本发明提供能够提高显示图像的显示质量的显示装置及平视显示器装置。显示装置(10)具备：发出光的光源(19)、基于来自光源(19)的光显示显示图像的显示部(13)、将来自光源(19)的光设为平行光的准直透镜(17)、将平行光配光向显示部(13)的配光透镜(20)。