To prevent stain of a blind and prevent incursion of a harmful suspended matter by incorporating the blink in a double glass sash and using a ceramic fitter net on a net door.

The slat 3 of a blind is disposed in the intermediate part of a double glass fixed on a window frame body 1, and a slat angle adjustment lever 4 and a lift cord 5 are provided inside the window frame body 1 to control light. A vertical blind, a roll screen and the like can be used as the blind. In addition, an aluminum door using a ceramic filter having air cleaning function is provided on the outside of the window. Thereby since the slat 3 of the blind is incorporated between the two glasses, stain by dust and the like are prevented not to need cleaning, and incursion of harmful suspended matter such as exhaust gas, pollen and various germs by the ceramic filter net of the aluminum door can be remarkably reduced.