PURPOSE: To easily assemble an illumination fixture and manufacture it at a low cost by fixing an opening edge section to the edge section of a projection opening.

CONSTITUTION: Protruded support sections 3 are formed in a box-shaped fixture main body 1 with a projection opening 2, and a main reflecting plate 6 is supported by the support sections 3 between a pair of side reflecting plates 4 in the main body 1 having hooking projections 5 on the periphery section except a front edge section. When both side edges and the bottom face of the main reflecting plate 6 are brought into contact with the side reflecting plates 4 and the hooking projections respectively, the side reflecting plates 4 are hooked on the support sections 3, and an opening edge section is fixed to the edge section of the projection opening 2. Assembling is simplified, no fixing tool is required, and an illumination fixture can be manufactured at a low cost.