To make a screen enclosable in roll shape and a guide pipe movable and enlarge effective opening of an opening part without the risk of impairing fine appearance or the like.

Grooves are provided at the mutually facing side faces of wall installed type guide rails 16, 16 provided side by side at a flat opening part 10. A runner travelable into the guide rails is movably provided on both sides of a tip bottom 13 of a screen and one or a plurality of guide pipes 8 for preventing looseness of the screen, through the grooves. A pull chain 17 serving as a guide pipe moving device for moving the guide pipe 8 synchronously with pulling-out and winding of the screen is additionally provided among the tip bottom, each guide pipe and a body bracket metal 12.