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, IGU, having multiple layers of glazing, the IGU having an exposed interior major surface for facing an interior of the building, the exposed interior major surface being of an interior pane layer of the IGU, the interior pane layer having a periphery and a first peripheral side, a first of the frame side members being associated with a first of the sash side members, the first frame member and sash side member extending in a respective longitudinal direction in parallel with the first peripheral side of the interior pane,a height direction being defined as extending perpendicularly to the interior major surface of the IGU of the skylight window, an outward direction and an inward direction extending from the first peripheral side in opposite directions, the outward direction extending away from the IGU perpendicularly to both the longitudinal direction and the height direction and the inward direction being opposite to the outward direction, the first frame side member comprising a lining panel reception groove located interior to the interior major surface of the IGU, wherein there is a distance D1, in the height direction, between a most interior surface of the first frame side member and the interior pane layer of the IGU, where in the first frame member comprises a primary leg and a secondary leg, where the primary leg is outwards in relation to the first peripheral side of the interior pane layer and extends in the height direction, and where the secondary leg extends in the inward direction on an interior side of said interior major surface of the IGU, wherein a distance D2 between a bottom of the lining panel reception groove and the most interior surface of the first frame side member is at least 1/3 of D1 in the height direction, and characterized in that wherein the secondary leg of the first frame side member is on an interior side of the first sash side member. a window frame having four frame side members, a window sash having four sash side members supporting an Insulating Glazing Unit, IGU, having multiple layers of glazing, the IGU having an exposed interior major surface for facing an interior of the building, the exposed interior major surface being of an interior pane layer of the IGU, the interior pane layer having a periphery and a first peripheral side, a first of the frame side members being associated with a first of the sash side members, the first frame member and sash side member extending in a respective longitudinal direction in parallel with the first peripheral side of the interior pane,a height direction being defined as extending perpendicularly to the interior major surface of the IGU of the skylight window, an outward direction and an inward direction extending from the first peripheral side in opposite directions, the outward direction extending away from the IGU perpendicularly to both the longitudinal direction and the height direction and the inward direction being opposite to the outward direction, the first frame side member comprising a lining panel reception groove located interior to the interior major surface of the IGU, wherein there is a distance D1, in the height direction, between a most interior surface of the first frame side member and the interior pane layer of the IGU, where in the first frame member comprises a primary leg and a secondary leg, where the primary leg is outwards in relation to the first peripheral side of the interior pane layer and extends in the height direction, and where the secondary leg extends in the inward direction on an interior side of said interior major surface of the IGU, wherein a distance D2 between a bottom of the lining panel reception groove and the most interior surface of the first frame side member is at least 1/3 of D1 in the height direction, and characterized in that wherein the secondary leg of the first frame side member is on an interior side of the first sash side member.