To facilitate the fitting adjustment of sliding tools, by arranging fitting adjustment type sliding tools at the right and left hands of a lower sash and containing the lower sash in the lower part of a rail frame and arranging it to be taken in the stile-fitting groove and shortening the insertion size of tool from the side end of rail frame to the sliding tool.

A rail-insertion part to a partition wall 3d is arranged at the lower part of the inner periphery of a sliding screen stile F3 to position a first taking-in part reaching a hollow part. A second taking-in part is arranged at both ends of the lower part than the partition wall 2d of the lower rail F2. Then, fitting holes 35 are made in the stile side end wall and the partition wall 3d and adjusting holes 36 are bored on the side end wall 3c. The lower rail F2 is inserted in a rail-insertion part and fixed with tapping screws N. Next, a sliding tool B is inserted in an insertion part from the lower side of the lower sash F5 and fixed therein. And the lower rail F2 and the lower sash F5 are inserted in respective taking-in parts and fixed with screws. When the adjusting screw 9 is rotated to pull the inner body into a case body, the door wheel is moved up. And the door wheel 8 is lowered by separating the inner body from the case body and the door wheel 8 is vertically moved up and don along the vertical guide groove by the sliding movement of the inner body to the right and left sides.