An optical unit includes one or more optical elements 15 and 25. At least one of the one or more optical elements has an optical functional surface that refracts incident light and rough surfaces 19 and 29 formed on an outer side with respect to the optical functional surface. The rough surfaces scatter the incident light which has been internally reflected. With this configuration, the rough surface formed on the surface located on the outer side with respect to the optical functional surface scatters the light which is incident on the optical element and which may generate ghost due to its internally reflection by the surface located on the outer side with respect to the optical functional surface. Therefore, generation of the ghost is suppressed. Also, since the optical unit includes the optical element having the rough surface, the generation of the ghost is suppressed.