Abstract: An image display apparatus including a metal outer housing for which a filling process in a thixotropic forming method has been improved. On a reference surface of an upper housing composing the outer housing of a projection display apparatus, there are formed convex sections, and a supporting rib, the foregoing convex sections extending in the direction where a semimolten metal flows, and the foregoing supporting rib intersecting with the foregoing convex sections. Furthermore, protrusions are formed protruding from the reference surface, and flowing ribs are independently formed on base sections of the protrusions. These convex sections, supporting rib, and flowing ribs are formed in the upper housing for guiding the semimolten metal in the thixotropic forming method, and thereby ensuring filling characteristics of the semimolten metal into individual molds.

Abstract: An optical component housing is provided which is easy to form and in which dimensional accuracy of an optical component positioning portion is easily ensured. The optical component housing for housing an optical component constituting an optical system is made of metal and has an optical component positioning portion for positioning an optical component. The optical component positioning portion is formed by thixomolding using a metal material, and includes first support portions for supporting the light incident surface or the light emitting surface of the optical component. A portion of a side plate in contact with the first support portions is provided with portions previously removed that are formed by inserting inserts in a mold.