A projection display apparatus that can prevent deviation in the light quantity distribution of the projected image is provided. A projection display apparatus includes: a light source unit including a light emitting element; an image light generator modulating light from the light source unit to emit image light; a projecting unit projecting the image light; a polarization modulator on which the image light is made incident and that emits light in a particular polarization state; and a depolarizer arranged on the optical path between the light emitting element and the polarization modulator.