A skylight window for being installed in or on a roof of a building, wherein the skylight window comprises: a window frame having four frame side members delimiting a frame opening and defining a frame plane, and where at least some of said frame side members comprise a groove configured to receive an edge of a lining panel and extending in a longitudinal direction of the respective frame side member, an Insulating Glazing Unit , abbreviated as IGU, supported on the window frame and covering the frame opening, said IGU comprising at least two translucent layers (5c-5e) with a sealed space between them, where an inert gas, such as argon or krypton, or a vacuum is present in the space(s) between the translucent layers, and a weather shield pane configured to protect a window portion of the skylight window , said window portion comprising the window frame and the IGU , and said weather shield pane being located at a distance from an exterior side of the IGU so that a space is present between them, where the window frame has an overall height (H) in a height direction perpendicular to the frame plane, and where each frame side member has a longitudinal direction extending along a peripheral side of the IGU, characterised in that an exposed frame surface of the frame side member extends between the groove and the IGU , said exposed frame surface having a first edge extending in the longitudinal direction along the groove and a second edge extending in the longitudinal direction along an interior side of the IGU, and that the exposed frame surface has an overall width corresponding to the total distance between the first edge and the second edge measured along the exposed frame surface and perpendicular to the longitudinal direction of 40 mm or less. a window frame having four frame side members delimiting a frame opening and defining a frame plane, and where at least some of said frame side members comprise a groove configured to receive an edge of a lining panel and extending in a longitudinal direction of the respective frame side member, an Insulating Glazing Unit , abbreviated as IGU, supported on the window frame and covering the frame opening, said IGU comprising at least two translucent layers (5c-5e) with a sealed space between them, where an inert gas, such as argon or krypton, or a vacuum is present in the space(s) between the translucent layers, and a weather shield pane configured to protect a window portion of the skylight window , said window portion comprising the window frame and the IGU , and said weather shield pane being located at a distance from an exterior side of the IGU so that a space is present between them, where the window frame has an overall height (H) in a height direction perpendicular to the frame plane, and where each frame side member has a longitudinal direction extending along a peripheral side of the IGU, characterised in that an exposed frame surface of the frame side member extends between the groove and the IGU , said exposed frame surface having a first edge extending in the longitudinal direction along the groove and a second edge extending in the longitudinal direction along an interior side of the IGU, and that the exposed frame surface has an overall width corresponding to the total distance between the first edge and the second edge measured along the exposed frame surface and perpendicular to the longitudinal direction of 40 mm or less. <EOS>