A roof window comprising a window sash and a window frame with a fitting for a window sash, - the window frame having a design enabling the window frame to be immersed in the roof structure, the window frame having the form of a rectangular frame and comprising: a top member, a bottom member and two side members (11; 19), - the window frame being equipped with said fitting constituting at least an installation set of the window sash, - the window frame further comprising at least one structural element (2, 8) for connecting the window frame with the roof, said at least one structural element (2, 8) of the window frame protruding beyond the outline of the window frame members (11 or 19, 12, 13), - the window sash comprising a glazing unit, the window sash being situated in the opening of the window frame at least when the window is closed, the window sash being opened by rotation around at least one horizontal geometrical axis, - the window sash as well having elements of a locking set for when the window sash is in a closed position, - the window frame mating with shields of gaps between the window frame and the window sash, and the window frame comprising a set of seals in these gaps, characterised in that: - the at least one structural element (2, 8) of the window frame is located in use on the top surface of the window frame members (11 or 19, 12, 13), while said at least one structural element (2, 8) of the window frame protrudes beyond the outline of the window frame members (11 or 19, 12, 13), - hinges (5, 9) are installed on the at least one structural element (2, 8), - and said at least one horizontal geometrical axis is located, in use, slightly above the surface of the window frame. - the window frame having a design enabling the window frame to be immersed in the roof structure, the window frame having the form of a rectangular frame and comprising: a top member, a bottom member and two side members (11; 19), - the window frame being equipped with said fitting constituting at least an installation set of the window sash, - the window frame further comprising at least one structural element (2, 8) for connecting the window frame with the roof, said at least one structural element (2, 8) of the window frame protruding beyond the outline of the window frame members (11 or 19, 12, 13), - the window sash comprising a glazing unit, the window sash being situated in the opening of the window frame at least when the window is closed, the window sash being opened by rotation around at least one horizontal geometrical axis, - the window sash as well having elements of a locking set for when the window sash is in a closed position, - the window frame mating with shields of gaps between the window frame and the window sash, and the window frame comprising a set of seals in these gaps, characterised in that: - the at least one structural element (2, 8) of the window frame is located in use on the top surface of the window frame members (11 or 19, 12, 13), while said at least one structural element (2, 8) of the window frame protrudes beyond the outline of the window frame members (11 or 19, 12, 13), - hinges (5, 9) are installed on the at least one structural element (2, 8), - and said at least one horizontal geometrical axis is located, in use, slightly above the surface of the window frame.