Multi-layer heat insulating pane element

A multi-layered heat insulating window panel (10), comprising:

• a first pane (12) and
• a supplementary pane (14) on at least one surface of the first pane (12), forming at least one double-glazing arrangement,
• wherein the double-glazing arrangement comprises an assembly edge (53) which can be framed and attached in the frame structure (36) and which is kept in position by the frame structure (36) after being installed, wherein the supplementary pane (14) has a tray-like shape with an inner window area (16) and an edge region (18) surrounding the window area, wherein the edge region (18) has a sealing frame (43) with a circumferential sealing surface (44) and a connecting frame (48) which connects the sealing frame (43) with the window area (16), wherein the connecting frame (48) extends vertically or transverse to the window plane (E) so that the window area (16) and the sealing surface (44) are offset in parallel in relation to the window plane (E) and the window area (16) is mostly spaced apart from the first pane, forming a sandwich-like cavity (34) in the window area between the first pane (12) and the supplementary pane (14), wherein the sealing surface (44) forms a complete circumferential hermetic connection with the first pane (12) and the cavity (34) between the first pane (12) and the supplementary pane (14) is closed in vacuum-tight manner, wherein the window area (16) comprises a number of supporting elements (26, 26′, 26″, 26′″) protruding from the plane (F) of the window area, and wherein the supplementary pane (14) is designed in the form of a plastic molding, and the supporting elements in the direction of the first pane (12) are formed as an integral part of the supplementary pane (14) and form a supporting grid (28) with a pre-defined maximum spacing between the supporting elements, wherein the cavity (34) is evacuated and the supporting grid (28) of the supplementary pane (14) firmly supports the supplementary pane (14) and the first pane (12) against each other in order to prevent collapsing due to the external atmospheric pressure.