A projection display apparatus includes a light shielding member provided with an opening through which light from a light source passes, and a light modulation element unit configured to face the light shielding member to be illuminated by the light passing through the opening of the light shielding member, the light shielding member has a first region and a second region that is located between the first region and the opening, the light modulation element unit has a third region facing the first region, and a fourth region facing the second region, and a first average temperature gradient between the first region and the third region is greater than a second average temperature gradient between the second region and the fourth region.