To provide a reformation structure leaving existing sash frames in principle, in a reform structure of existing sashes, in which barrier free can be realized at the outdoor side and a novel sash of which the upper face of the lower frame is flat can be fitted, and by which the opened width of Shoji can be widened.

A bracket is extended to the room outdoor side from the existing sash lower rail, the bracket and the lower rail for a new sash are connected together, a height adjusting means is provided in the bracket so as to adjust the height of the lower rail, the height of the upper face of the novel lower rail formed on a substantially flat face and the height of the existing floor face are set so that these are made flush with each other, and further, a single sliding screen wider than the existing sliding screen is used in place of the existing sliding screen.