A collapsible tanning booth comprises at least two rear lamp units and at least two front lamp units, each of the units having a thin long casing that includes rear, side, top and bottom walls and a front panel, the front panel being of a material transmissive to ultraviolet light, a reflector panel adjacent the rear wall and lamps mounted between the reflector panel and the front panel. The rear lamp units are hinged together along their adjacent side walls so that they can be moved between a storage configuration in which they are substantially aligned transversely and a use configuration in which they are oblique transversely to each other. The laterally outermost front units are hinged along their laterally outermost side walls to the laterally outermost side walls of the rear lamp units so that the front units can be moved between a storage configuration in which they reside face to face against the rear lamp units and a use configuration in which they are disposed oblique to the rear lamp units and to each other. Two adjacent front lamp units, however, are unattached to each other to enable pivotal movement of such units about their hinges apart from each other to provide an opening for access by a person to a space defined by the units in their use configuration.