A roof window comprising: a stationary frame adapted to be built into a structure and having a top member, two side members (13, 14) and a bottom member, and defining a frame plane, a sash having a top member, two side members (23, 24) and a bottom member, and carrying a pane and defining a sash plane in parallel with the pane, an intermediate frame, at least one first hinge connection for connecting the sash and the intermediate frame to the stationary frame, releasable locking means for releasing the engagement between the intermediate frame and the sash at the first hinge connection, at least one second hinge connection for connecting the sash to the intermediate frame, operating means for opening and closing the sash relative to the frame, and a first set of cover elements being provided on the stationary frame and a second set of cover elements provided on the sash to provide a substantially weather-proof transition between the roof window and the surroundings, the second set of cover elements including a top sash cover element, wherein the top sash cover element comprises a first leg section substantially parallel to the sash plane and a second leg section at an angle thereto, characterized in that the first set of cover elements includes a top frame cover element, and that the top sash cover element overlaps the top frame cover element to a maximum opening angle when the sash is rotated in a first direction relative to the frame plane, but may be moved away from said overlap by release of the locking means and by rotation of the sash in a second direction opposite the first direction, and that a third set of cover elements includes an intermediate frame cover element, which is adapted to be brought into releasable contact with the top sash cover element, preferably at a sealing member. a stationary frame adapted to be built into a structure and having a top member, two side members (13, 14) and a bottom member, and defining a frame plane, a sash having a top member, two side members (23, 24) and a bottom member, and carrying a pane and defining a sash plane in parallel with the pane, an intermediate frame, at least one first hinge connection for connecting the sash and the intermediate frame to the stationary frame, releasable locking means for releasing the engagement between the intermediate frame and the sash at the first hinge connection, at least one second hinge connection for connecting the sash to the intermediate frame, operating means for opening and closing the sash relative to the frame, and a first set of cover elements being provided on the stationary frame and a second set of cover elements provided on the sash to provide a substantially weather-proof transition between the roof window and the surroundings, the second set of cover elements including a top sash cover element, wherein the top sash cover element comprises a first leg section substantially parallel to the sash plane and a second leg section at an angle thereto, characterized in that the first set of cover elements includes a top frame cover element, and that the top sash cover element overlaps the top frame cover element to a maximum opening angle when the sash is rotated in a first direction relative to the frame plane, but may be moved away from said overlap by release of the locking means and by rotation of the sash in a second direction opposite the first direction, and that a third set of cover elements includes an intermediate frame cover element, which is adapted to be brought into releasable contact with the top sash cover element, preferably at a sealing member.