Patent ID: 8192035

Claim:
A projection display apparatus which includes a housing case housing a solid light source, a light valve configured to modulate light emitted from the solid light source, a projection unit configured to project light emitted from the light valve on a projection plane, which is placed on a first placement surface substantially parallel to the projection plane or a second placement surface substantially orthogonal to the first placement surface, wherein the housing case has a base plate and a ceiling plate, the base plate facing the second placement face, the ceiling plate being provided on an opposite side to the base plate, the ceiling plate is provided with a recessed portion recessed inward of the housing case, the recessed portion has an inclined surface inclining downward toward the projection plane, and the inclined surface has a transmission area through which light emitted from the projection unit passes, wherein side surfaces are provided on respective sides of the recessed portion in a horizontal direction parallel to the projection plane incline toward a center of the recessed portion.