Abstract: There is disclosed a liquid-crystal projection apparatus having a lamp device which has such a sealed or closed construction that a sound, produced upon bursting of a light-emitting tube, is suppressed and that the scattering of glass pieces is prevented. In this liquid-crystal projection apparatus, a lamp is sealed by a support member, supporting a concave mirror having two notches and an outer casing and a flat glass panel and an air passage is formed in the support member. The lamp is releasably attached to a lamp fixing member and two open portions are formed in this lamp fixing member and a cooling fan is fixedly connected to one of the two open portions.