A fitting arrangement for the leaf of a window, of a door or the like, said fitting arrangement comprising - a pivot arm which is configured to be fastened to the leaf and which has, at a hinge-side end of its longitudinal extent, a stay support having a leg angled transversely to the longitudinal extent, and - a support band which is configured to be pivotably supported with a bearing section at a pivot bearing, which is to be provided at the frame of the window or the door, about an axis of rotation of the pivot bearing and which has a coupling section which can be coupled to the angled leg of the stay support of the pivot arm by means of a bayonet fastening, wherein the bayonet fastening comprises a bayonet pin extending along a pin axis and a bayonet receiver, said bayonet pin and bayonet receiver being configured such that, in order to close the bayonet fastening, the bayonet pin is axially plugged into the bayonet receiver with respect to the pin axis and is subsequently rotated relative to the bayonet receiver about the pin axis into a coupling position in which form-fitting means of the bayonet pin engage behind corresponding form-fitting means of the bayonet receiver and thereby block the bayonet pin against axially exiting from the bayonet receiver, and wherein a securing spring comprising a latching tongue is provided at the bayonet receiver, said latching tongue being arranged such that: - on the axial plugging of the bayonet pin into the bayonet receiver, the latching tongue is acted on by the bayonet pin and is axially deflected into a deflection position with respect to the pin axis against a return force of the securing spring; and - by rotating the bayonet pin into the coupling position, the latching tongue is released for a return into a blocking position into which it is displaced due to the return force of the securing spring and in which it blocks the bayonet pin against a rotation out of the coupling position, characterized in that the latching tongue of the securing spring is arranged such that it engages into the bayonet receiver in the blocking position. - a pivot arm which is configured to be fastened to the leaf and which has, at a hinge-side end of its longitudinal extent, a stay support having a leg angled transversely to the longitudinal extent, and - a support band which is configured to be pivotably supported with a bearing section at a pivot bearing, which is to be provided at the frame of the window or the door, about an axis of rotation of the pivot bearing and which has a coupling section which can be coupled to the angled leg of the stay support of the pivot arm by means of a bayonet fastening, wherein the bayonet fastening comprises a bayonet pin extending along a pin axis and a bayonet receiver, said bayonet pin and bayonet receiver being configured such that, in order to close the bayonet fastening, the bayonet pin is axially plugged into the bayonet receiver with respect to the pin axis and is subsequently rotated relative to the bayonet receiver about the pin axis into a coupling position in which form-fitting means of the bayonet pin engage behind corresponding form-fitting means of the bayonet receiver and thereby block the bayonet pin against axially exiting from the bayonet receiver, and wherein a securing spring comprising a latching tongue is provided at the bayonet receiver, said latching tongue being arranged such that: - on the axial plugging of the bayonet pin into the bayonet receiver, the latching tongue is acted on by the bayonet pin and is axially deflected into a deflection position with respect to the pin axis against a return force of the securing spring; and - by rotating the bayonet pin into the coupling position, the latching tongue is released for a return into a blocking position into which it is displaced due to the return force of the securing spring and in which it blocks the bayonet pin against a rotation out of the coupling position, - on the axial plugging of the bayonet pin into the bayonet receiver, the latching tongue is acted on by the bayonet pin and is axially deflected into a deflection position with respect to the pin axis against a return force of the securing spring; and - by rotating the bayonet pin into the coupling position, the latching tongue is released for a return into a blocking position into which it is displaced due to the return force of the securing spring and in which it blocks the bayonet pin against a rotation out of the coupling position, characterized in that the latching tongue of the securing spring is arranged such that it engages into the bayonet receiver in the blocking position.