An illuminator includes a light source, a collimation system on which a light beam flux emitted from the light source is incident, and a light forming system including a lens array including a plurality of lenses. The plurality of lenses each have a lens surface having a non-rotationally symmetric free-form surface. The light forming system is configured to cause the plurality of lenses to divide the light beam flux having passed through the collimation system into a plurality of sub-light beam fluxes and the plurality of sub-light beam fluxes to be incident on an illuminated area.