A hinged panel door comprises a plurality of thermoplastic panels each having a main body with an outside wall, an inside wall, an open ended female receptacle formed centrally in one end and a male receptacle protruding centrally from the other end of the main body. The male connector has a rounded head and a neck joining the head to a shoulder on the main body of the panel. Both the head and the shoulder are wider than the neck. The female receptacle is formed by a rounded wall circumscribing the major part of a circle and interrupted by a mouth having a width slightly greater than that of the neck of the male connector. The inner wall of the panel is shorter than the outer wall which provides a one way hinged connection between the receptacle of one of the panels and the connector of another one of the panels.