A fastening clamp for fastening a panel (30, 30.1), for example a photovoltaic module, to a support, said fastening clamp (1, 1.1) comprising - a connecting part (2, 2.1) with a connecting member (9, 9.1) for connecting the fastening clamp to the support for forming a clamping abutment on the support side and with a supporting abutment, - a clamping element, which can be set up with respect to the connecting part, having a clamping leg having a clamping extension for bearing against a panel to be fastened and having a supporting leg for supporting the clamping element on the supporting abutment of the connecting part, the clamping extension being arranged opposite the supporting leg, and - a clamping device (4, 5) with a clamping means, which passes through the clamping leg and is supported thereon, for setting the clamping element with the connecting part characterized in that the supporting abutment of the connecting part comprises at least two supporting abutment legs (8, 8.1) spaced apart from one another by supporting surfaces in the transverse direction to the clamping action direction, wherein the supporting surfaces are provided by a contour of the outwardly pointing end face of the supporting abutment legs (8, 8.1) and on which supporting surfaces the supporting leg of the clamping element is supported when the clamping element is clamped to the connecting part when the clamping extension acts on a panel, in that the supporting abutment legs (8, 8.1) of the connecting part are connected to one another by a strip of material following the longitudinal extension thereof (10, 10.1) and are part of a leg (6, 6.1) of the connecting part which extends in the clamping action direction and which leg (6, 6.1) forms an angle piece with a clamping abutment leg (7, 7.1) which is arranged transversely thereto and on which the clamping means (4, 5) acts when the clamping element is clamped to the connecting part, and in that the leg carries at least one first connecting element in its end section pointing away from the clamping abutment leg. - a connecting part (2, 2.1) with a connecting member (9, 9.1) for connecting the fastening clamp to the support for forming a clamping abutment on the support side and with a supporting abutment, - a clamping element, which can be set up with respect to the connecting part, having a clamping leg having a clamping extension for bearing against a panel to be fastened and having a supporting leg for supporting the clamping element on the supporting abutment of the connecting part, the clamping extension being arranged opposite the supporting leg, and - a clamping device (4, 5) with a clamping means, which passes through the clamping leg and is supported thereon, for setting the clamping element with the connecting part characterized in that the supporting abutment of the connecting part comprises at least two supporting abutment legs (8, 8.1) spaced apart from one another by supporting surfaces in the transverse direction to the clamping action direction, wherein the supporting surfaces are provided by a contour of the outwardly pointing end face of the supporting abutment legs (8, 8.1) and on which supporting surfaces the supporting leg of the clamping element is supported when the clamping element is clamped to the connecting part when the clamping extension acts on a panel, in that the supporting abutment legs (8, 8.1) of the connecting part are connected to one another by a strip of material following the longitudinal extension thereof (10, 10.1) and are part of a leg (6, 6.1) of the connecting part which extends in the clamping action direction and which leg (6, 6.1) forms an angle piece with a clamping abutment leg (7, 7.1) which is arranged transversely thereto and on which the clamping means (4, 5) acts when the clamping element is clamped to the connecting part, and in that the leg carries at least one first connecting element in its end section pointing away from the clamping abutment leg.