Abstract: A shutter device for covering or screening a door or window of buildings is disclosed. The shutter device is composed of a plurality of slats adapted to be continuously arranged in a same plane when the slats are supported by guide rails arranged at both sides thereof. Each slat is connected through a link mechanism to adjacent slat such that, in the case of enclosing each slat in a slat enclosing region, when each slat reaches to a conversion region located at one end of a supporting surface formed by a guide rail, each slat is moved laterally in front of or in the rear of the supporting surface to provide a space which permits a succeeding slat to enter into the conversion region and that, in the case of delivering each slat from the slat enclosing region, when each slat is moved from the conversion region along the supporting surface of the guide rail, the succeeding slat is pulled into the conversion region.