To provide a projection type image display device capable of improving an energy-saving effect.

A projector 1 includes a projector unit 100 for projecting an image, and a sunlight condensing unit 200 configured to guide sunlight to the projector unit 100. The projector unit 100 is mounted with a light source lamp for emitting artificial light. The projector unit 100 includes: a light source switching part for selecting either one of the sunlight emitted by the sunlight condensing unit 200 or the artificial light emitted by the light source lamp, for illumination light; and a projecting part for modulating the illumination light selected by the light source switching part to an image light and projecting that. The light source switching part selects the artificial light from the light source lamp for the illumination light in a normal mode, and on the other hand, selects the sunlight for the illumination light in a super economy mode.