A projection-type image displaying apparatus takes in outside air through an air inlet formed in a housing unit to cool at least one of an optical modulator and an optical element that are accommodated in the housing unit, the optical modulator forming an optical image and the optical element being disposed between the optical modulator and a light source. The projection-type image displaying apparatus includes a cooling fan, a first dustproof filter disposed at the air inlet of the housing unit, a second dustproof filter disposed in a flow path that guides the outside air toward the optical modulator or the optical element after the outside air passes through the first dustproof filter and the cooling fan, and a holder for holding the optical modulator or the optical element, the holder having an outside-air introducing portion, wherein the second dustproof filter is attachable to the outside-air introducing portion.