An adjusting device for fastening an operating and/or display device on a wall, having a linear guide arrangement formed by a sliding element and a fastening element, wherein the sliding element has an attachment point for the operating and/or display device. A secure support of the operating/display element results if the fastening element or the sliding element has a pivotable seating arrangement or hinge, with a pivot axis oriented parallel with respect to the displacement direction of the linear guide arrangement. The fastening element can be supported on the wall on two supporting points, which are spaced apart in the displacement direction of the linear guide arrangement.