Abstract: A panel structure for manufacturing plate-shaped module units and elements built thereof comprising a frame and a flat fastening member mounted at one side of said frame, said fastening member forming an open bottom and being provided with projections and indentations to align identical adjacent module units, the purpose of said panel structure being to form a protective and pattern- or relief-forming frame round a finished module unit. The panel structure may be used both for direct mounting of prefabricated module units and as a permanent shuttering in connection with moulding of a module unit of e.g. gypsum or concrete, and two of the outer edges of the frame are provided with tongues, whereas the two other outer edges are provided with corresponding grooves for joining together the frame and similar frames.