Abstract: A sliding bar slidable in opening-closing directions of a pleated screen device has therein a plurality of direction changing members each defining an arcuate guide surface. At least one end of wire of a tension system of the device is fixed. The wire may be formed of two cords, for example. These two cords are stretched between a pair of frame members, turned by the guide surface of a plurality of the direction changing members in the sliding bar, cross over each other in the sliding bar, and extend into each of the frame members. A pleated screen is foldable and spreadable between the sliding bar and a frame member opposed to the sliding bar. The pleated screen is supported in the opening-closing directions by the cords.