A solar energy suntan booth including a heat collector plate mounted on a base for inclining the collector plate so that it is adapted for use as a surface for more effectively receiving the sun's radiation. The collector plate forms the top of an enclosed dead air space for receiving and retaining solar heat from the collector plate for transference back through the collector plate when it cools. The collector plate supports side extension members from the edges thereof and which are foldable from a collapsed position to an operating position serving to retain warmed air immediately above the collector plate thereby forming a layer of warm air within a space defined by the side extension members and collector plate. The collector plate and the side extension members are black for more effective heat absorption. The booth may be adjustably inclined and portable or of fixed inclined construction and the dead air space may have electric heater means to augment the heat collected in the dead air space. Piano hinges are mounted along two opposite sides of the collector plate and shackle hinges are mounted along the other two sides thereof, and the lower side extension is controlled by a handle member for adjusting its position for maximizing reception of solar energy and heat onto the collector plate.