A skylight window for being installed in a roof of a building, the skylight window comprising: a window frame having four frame side members, a window sash having four sash side members supporting an insulating glazing unit, abbreviated IGU, having multiple layers (5c,5d,5e) of glazing, said window sash being movable in relation to the window frame between an open and a closed position of the skylight window, and a weather shield attached to the sash so as to protect a window portion of the skylight window, the window portion comprising the sash, frame and IGU, each frame side member being associated with a respective sash side member, each of said frame and sash side members extending in a respective longitudinal direction substantially in parallel with a respective peripheral side of the IGU, said IGU having an exposed interior major surface for facing an interior of said building in an installed position of the skylight window, said interior major surface extending in an outward direction away from a center of the IGU, an inward direction extending in a direction opposite to said outward direction, said IGU further having an exposed exterior major surface for facing in an exterior direction, which is opposite of said interior of said building in said installed position of the skylight window and extending away from and at a right angle to said exterior major surface of the IGU, said exterior major surface extending in the outward direction, where said weather shield extends across substantially the entire exposed exterior major surface, said frame side members comprising at least one sealing element, wherein a first frame side member comprises a primary leg, which in said closed position extends in the longitudinal direction and in the exterior direction substantially in parallel with a first peripheral side of the IGU along an outwardly facing surface of the IGU, and a secondary leg, which in said closed position extends along a part of the exposed interior major surface of the IGU and substantially in parallel with the interior major surface of the IGU, wherein said at least one sealing element is provided on the secondary leg of the first frame side member, characterized in that, in said closed position of the skylight window, said exposed interior major surface of the IGU abuts on said at least one sealing element. a window frame having four frame side members, a window sash having four sash side members supporting an insulating glazing unit, abbreviated IGU, having multiple layers (5c,5d,5e) of glazing, said window sash being movable in relation to the window frame between an open and a closed position of the skylight window, and a weather shield attached to the sash so as to protect a window portion of the skylight window, the window portion comprising the sash, frame and IGU, each frame side member being associated with a respective sash side member, each of said frame and sash side members extending in a respective longitudinal direction substantially in parallel with a respective peripheral side of the IGU, said IGU having an exposed interior major surface for facing an interior of said building in an installed position of the skylight window, said interior major surface extending in an outward direction away from a center of the IGU, an inward direction extending in a direction opposite to said outward direction, said IGU further having an exposed exterior major surface for facing in an exterior direction, which is opposite of said interior of said building in said installed position of the skylight window and extending away from and at a right angle to said exterior major surface of the IGU, said exterior major surface extending in the outward direction, where said weather shield extends across substantially the entire exposed exterior major surface, said frame side members comprising at least one sealing element, wherein a first frame side member comprises a primary leg, which in said closed position extends in the longitudinal direction and in the exterior direction substantially in parallel with a first peripheral side of the IGU along an outwardly facing surface of the IGU, and a secondary leg, which in said closed position extends along a part of the exposed interior major surface of the IGU and substantially in parallel with the interior major surface of the IGU, wherein said at least one sealing element is provided on the secondary leg of the first frame side member, characterized in that, in said closed position of the skylight window, said exposed interior major surface of the IGU abuts on said at least one sealing element.