To solve the following problems of a constitution of the prior arts; although interception of the sunshine outside a window is the first and the best thing to control air-conditioning in mid-summer, an appentice is rarely adopted to a new building because of the design, a full two-story house does not have an eaves and an post-installed awning has a trouble in wind pressure and is too expensive to install on each window, while there is a limit to save energy in air-conditioning without a sunshade.

The invention aims to expand use of the sun shade, which is improved in design and durability and can easily be attached not only on a new building but also on a reformed building, so as to prevent the sunlight from entering through the window in summer and, thus to save energy.