<p>A sliding screen door enabling the slidable opening/closing of a net formed to be extended/retracted by alternately folding it. A net guide guiding the net is formed to be formed in a linear rail shape in the state of being led out from a frame member so that a net holding member along the net guide can be smoothly moved. The net guide (12) moving, from the lower ends of the vertical frame members (6), to and from the insides of the vertical frame members (6) fitted to both ends of the net in the opening/closing direction according to the opening/closing of the net (4) and guiding the lower end of the net is formed such that a series of guide rails arranged continuously with each other through the vertical wall parts of the adjacent guide blocks can be formed by inserting a series of wire members (16) in through-holes along the tips of the vertical wall parts to flexibly connect to each other a large number of guide blocks formed of bottom parts and vertical wall parts in a generally U-shape. A net holding member (20) suppressing the extraction of the end part of the net from the net guide is installed on the guide rail by engaging movably along the guide rail and directly or indirectly holding the end part of the net.</p>
