To improve daylighting and ventilation so as to create a sanitary room by providing a fixed window in which reinforced glass is fitted and an open and close window on a wall face consisting of a base of a wooden building, a beam, a column, and a brace.

A triangular window frame 4 is provided above and below a cross point of diagonal brace D on a wall face having the diagonal brace D of a wooden building. Reinforced glass is fitted in the window frame 4 to constitute a window 3. Reinforced glass is fitted in a window frame 2 on the right and left of the cross point of the diagonal brace D to constitute a pentagon window 1. Window sash of the window 3 and the window 1 is fixed on the diagonal brace D and a column C to form a fixed window or is opened and closed freely by a hinge to form an open and close window. Daylighting the improved by using reinforced glass, and ventilation becomes possible by forming the open and close window.