Abstract: The invention relates to space engineering, and can be used for space radio, television and telephone communications, as well as illuminating ground objects at night from space. The inventive unfolding film-type radiation reflector comprises a framework consisting of pneumatic tubes and cells, a film reflecting surface connected to the framework along the perimeter thereof and a gimbal assembly mountable on a space vehicle. The internal and external frames of the gimbal assembly are made from internal and external wheel-shaped pneumatic tubes. The internal wheel-shaped pneumatic tube is embodied in such a way that it is mountable on the space vehicle, while the external wheel-shaped pneumatic tube is embodied in the form of a framework element and is connected to the film reflecting surface. Said invention makes it possible to reduce the mass and overall dimensions of mechanisms for packing and unfolding the film-type radiation reflector.