Abstract: A car top carrier support which is operable for use on the gutters of a car top as well as on a gutterless car top including ledges at its opposite sides. The carrier support comprises a H-shaped frame with one longitudinal main tube and at least a pair of cross tubes. A central operating mechanism is mounted in the main tube and connected by four Bowden cables with four claws which are movably guided in legs fastened at the cross tubes for clamping the carrier support at the car top. By swinging only one hand lever of the central operating mechanism between two positions the carrier support is free to be removed from the car top. A key-operated locking device co-operating with the central operating mechanism provides a theftproof arrangement. Wire cables fastened at securing pins can be turned around articles on the carrier support and the pins can be locked in a theftproof way by the same central operating mechanism.