To shield and open one surface of a transparent panel by a moving panel.

Parts of a plurality of panel units (a panel group) 15 placed on a floor face and directed in the vertical direction are formed in the transparent panels 59, and a horizontal connecting rod 3 having a guide groove 7 directed in the longitudinal direction on at least one side face is fixed at the upper ends of a plurality of these panel units 15, while the opaque or semitransparent moving panels 54 in size capable of covering one surfaces of the transparent panels 59 are suspended movably into the guide groove 7 in the longitudinal direction so as to be superposed to the transparent panels 59.