The window has a stick frame for sticking two sliding wings (4) and held in a building opening by a thermal insulation part (8). The sliding wings are supported vertically to a wing plane. Shift guides (5) are displaced against each other and cover each other in an open position. The shift guides are formed such that the individual sliding wings exhibit different lengths according to different shift paths. The frame exhibits a length that corresponds to that of the shift guides in a displacement direction of the sliding wings. The frame is formed from longitudinal sections of a profile.
