A holder (100; 300) for a transmissive optical element of a laser processing device, having a frame for receiving in a laser beam guidance unit of the laser processing device, and having a mount for the transmissive optical element, wherein the transmissive optical element spans a plane in an X direction and a Y direction, wherein the mount is mounted within the frame with two adjusting elements offset at an angle (α) of 80° to 100° to one another in or parallel to the plane and is adjustable in the X direction and/or the Y-direction in each case at its distances (A, B) to the frame, wherein - the adjusting elements are each mounted in the frame such that they can pivot in the X and Y directions; - the mount-side ends of the adjusting elements are each mounted in the mount in the X and Y directions so that they can pivot; characterised in that - the adjusting elements are each mounted in the frame such that they are adjustable independently of one another in their respective length between the mount and the frame - the mount-side ends of the adjusting elements are each mounted in the mount in the X and Y directions so that they are displaceable in the longitudinal direction of the respective adjusting element; - the mount is mounted with a guide pin arranged in or parallel to the plane between, in particular centrally between, the two adjusting elements radially to the frame; - the mount-side end of the guide pin is fixed to the mount; and - the frame-side end of the guide pin is mounted in the frame such that it can pivot in the X and Y directions and is displaceable in the longitudinal direction of the guide pin. having a frame for receiving in a laser beam guidance unit of the laser processing device, and having a mount for the transmissive optical element, wherein the transmissive optical element spans a plane in an X direction and a Y direction, wherein the mount is mounted within the frame with two adjusting elements offset at an angle (α) of 80° to 100° to one another in or parallel to the plane and is adjustable in the X direction and/or the Y-direction in each case at its distances (A, B) to the frame, wherein - the adjusting elements are each mounted in the frame such that they can pivot in the X and Y directions; - the mount-side ends of the adjusting elements are each mounted in the mount in the X and Y directions so that they can pivot; - the adjusting elements are each mounted in the frame such that they can pivot in the X and Y directions; - the mount-side ends of the adjusting elements are each mounted in the mount in the X and Y directions so that they can pivot; characterised in that - the adjusting elements are each mounted in the frame such that they are adjustable independently of one another in their respective length between the mount and the frame - the mount-side ends of the adjusting elements are each mounted in the mount in the X and Y directions so that they are displaceable in the longitudinal direction of the respective adjusting element; - the mount is mounted with a guide pin arranged in or parallel to the plane between, in particular centrally between, the two adjusting elements radially to the frame; - the mount-side end of the guide pin is fixed to the mount; and - the frame-side end of the guide pin is mounted in the frame such that it can pivot in the X and Y directions and is displaceable in the longitudinal direction of the guide pin. - the adjusting elements are each mounted in the frame such that they are adjustable independently of one another in their respective length between the mount and the frame - the mount-side ends of the adjusting elements are each mounted in the mount in the X and Y directions so that they are displaceable in the longitudinal direction of the respective adjusting element; - the mount is mounted with a guide pin arranged in or parallel to the plane between, in particular centrally between, the two adjusting elements radially to the frame; - the mount-side end of the guide pin is fixed to the mount; and - the frame-side end of the guide pin is mounted in the frame such that it can pivot in the X and Y directions and is displaceable in the longitudinal direction of the guide pin.