Abstract: A window structure comprises a fame and an inwardly opening window leaf of a multi glazing type composed of a wooden casement as well as two glass panes. The outer glass pane consists of safety glass, e.g. tempered or laminated glass and the casement which carries the inner glass pane being in its entirety located on the inside of the outer glass pane and connected thereto, the outer glass pane having, in the closed state of the window leaf, its edge portions located between the casement and inwardly facing shoulder surfaces on the frame.