To provide an illumination device and a projection type image display device that illuminate an area to be illuminated (image formation area) under conditions where speckle noise is less noticeable. An illumination device according to the present invention includes: a light source 11 that emits coherent light; an optical scanning section 15 that scans the coherent light emitted from the light source 11; a lens array 22 including a plurality of element lenses and configured to diverge the light scanned by the optical scanning section; an optical path conversion system 23 configured to control a diverging angle of the diverging light to be emitted from respective points of the lens array 22 and to allow the diverging light whose diverging angle has been controlled to illuminate an area to be illuminated sequentially in an overlapping manner.

Means of solution: Optical protrusions 23 of nano-size for restricting reflection of light and protection columns 24 for preventing crushing of the optical protrusions 23 are provided on a surface of a film substrate 22. The protection columns 24 have a frustum shape. When a ratio of a projection area in which all of lateral surfaces of a single protection column 24 are projected on a surface of the film substrate 22 from a direction that is perpendicular to the surface of the film substrate 22 to a divided area on the surface of the film substrate 22 with respect to the single protection column 24 is defined to be a lateral surface projection occupying area rate, the lateral surface projection occupying area rate of the antireflection film is not more than 0.25% and not less than 0.01%.

A projection device for generating dynamic projections includes: an arrangement of multiple light sources spaced apart from each other; a collimation optic for generating a parallel beam path from the light sources and a microlens array arrangement within the beam path of the collimation lens. The focal length of the lenses at the illumination side of the microlens array arrangement is larger than the distance of the lenses from a slide plane.