Abstract: A chassis of one size can be used in various sizes of projection unit. That is, in a projection type television receiver having a projection unit of various sizes, one chassis can be commonly used. As a result, the cost is reduced. Includes (a) a chassis including a lower cabinet, a lower cover, an image display device, a speaker system, an optical unit, and a control circuit, and (b) a projection unit including an upper cabinet, an upper back cover, a transmission type screen, and a reflection mirror, the chassis and projection unit are mutually linked. Preferably, the lower cabinet has a speaker box, and the speaker box is formed integrally with the lower cabinet. As a result, the rigidity of the lower cabinet is enhanced. Preferably, the lower cabinet has a left supplementary side wall disposed detachably in the left part of the lower cabinet, and a right supplementary side wall disposed detachably in the right part of the lower cabinet.