An operating unit for a vehicle, in particular a man-machine interface for e.g. a vehicle component, such as a heating, ventilating and/or air conditioning system, an infotainment system, a navigation device and the like, for example, comprising - a housing having a front panel comprising a recess, - a display accommodated in the housing and having a display area which is arranged in the or behind the recess, and - a fastening device for fastening the display in the housing, - wherein the fastening device comprises a holding part holding the display, - wherein the holding part is arranged in the housing so as to be pivotable between a preassembly position and an installation position in which the display is located in the or behind the recess of the front panel, - wherein the housing - or alternatively the holding part - comprises a bearing axle which is constituted by a least one bar-shaped part (38, 38', 38") arranged in the housing - or alternatively in the holding part, - wherein the holding part - or alternatively the housing - comprises at least one bearing shell assembly having at least two gripping-around protrusions (48, 50) adapted to be mounted on the bar-shaped part (38, 38', 38"), which gripping-around protrusions define a circular-cylindrical bearing shell area for abutting on the at least one bar-shaped (38, 38', 38"), said bearing shell area extending over more than 180° and less than 270° and defining a mounting opening for mounting the bearing shell assembly on the bar-shaped part (38, 38', 38"), - wherein the installation position of the holding part is defined by abutting elements (34, 60) of the housing and the holding part, with the abutting elements abutting on each other, and - wherein the fastening device comprises at least one fastening element for fixing the holding part, in its installation position, in and/or at the housing characterized in that - the bar-shaped part (38, 38', 38") comprises, along its longitudinal extension, in at least one mounting portion a circumferential area having an outer contour which deviates from the shape complementary to the bearing shell area of the gripping-around protrusions (48, 50) of the at least one bearing shell assembly, - the bar-shaped part (38, 38', 38") is arranged in the housing - or alternatively the at least one bearing shell assembly at the holding part - so as to be oriented in such a way that the at least one bearing shell assembly, in the preassembly position of the holding part, is adapted to be mounted on the mounting portion of the bar-shaped part (38, 38', 38") and is pivotable from the preassembly position into the installation position in which the at least one bearing shell assembly grips around the bar-shaped part (38, 38', 38") within its mounting portion so as to be undetachable, - a housing having a front panel comprising a recess, - a display accommodated in the housing and having a display area which is arranged in the or behind the recess, and - a fastening device for fastening the display in the housing, - wherein the fastening device comprises a holding part holding the display, - wherein the holding part is arranged in the housing so as to be pivotable between a preassembly position and an installation position in which the display is located in the or behind the recess of the front panel, - wherein the housing - or alternatively the holding part - comprises a bearing axle which is constituted by a least one bar-shaped part (38, 38', 38") arranged in the housing - or alternatively in the holding part, - wherein the holding part - or alternatively the housing - comprises at least one bearing shell assembly having at least two gripping-around protrusions (48, 50) adapted to be mounted on the bar-shaped part (38, 38', 38"), which gripping-around protrusions define a circular-cylindrical bearing shell area for abutting on the at least one bar-shaped (38, 38', 38"), said bearing shell area extending over more than 180° and less than 270° and defining a mounting opening for mounting the bearing shell assembly on the bar-shaped part (38, 38', 38"), - wherein the installation position of the holding part is defined by abutting elements (34, 60) of the housing and the holding part, with the abutting elements abutting on each other, and - wherein the fastening device comprises at least one fastening element for fixing the holding part, in its installation position, in and/or at the housing - the bar-shaped part (38, 38', 38") comprises, along its longitudinal extension, in at least one mounting portion a circumferential area having an outer contour which deviates from the shape complementary to the bearing shell area of the gripping-around protrusions (48, 50) of the at least one bearing shell assembly, - the bar-shaped part (38, 38', 38") is arranged in the housing - or alternatively the at least one bearing shell assembly at the holding part - so as to be oriented in such a way that the at least one bearing shell assembly, in the preassembly position of the holding part, is adapted to be mounted on the mounting portion of the bar-shaped part (38, 38', 38") and is pivotable from the preassembly position into the installation position in which the at least one bearing shell assembly grips around the bar-shaped part (38, 38', 38") within its mounting portion so as to be undetachable,