A haptic operator control device for a motor vehicle has a magnetorheological brake with a brake component that is fixed to a holder and a brake component that is continuously rotatable relative to the fixed brake component. A first of the brake components extends in an axial direction and has a magnetically conductive core which extends in the axial direction, and a second brake component has a hollow shell part that encircles the first brake component. An encircling gap between the brake components is filled with a magnetorheological medium. An electrical coil is accommodated in the brake housing. At least one star contour with magnetic field concentrators formed thereon is arranged between the shell part and the core. The magnetic field concentrators project radially into the gap to define a varying gap height in a region of the star contour.