Magnetorheological brake device (1) with a brake housing (1a) and a fixed holder (4) and with at least two brake components (2, 3),where one of the two brake components (2, 3) is connected to the holder (4) rotationally and the two brake components (2, 3) are relatively continuously rotatable to each other, where a first brake component (2) extends in axial direction (20) and comprises a core extending in axial direction (20) of a magnetic conductive material and where the second brake component (3) comprises a coating part (13) which extends around the first brake component (2). Between the first and second brake components (2,3) is a circular and at least partly filled with a magnetorheological medium (6) column (5) formed In the brake housing (1a) at least one electric coil (26) is included, with at least one star contour (40) with magnetic field concentrators (80) formed between the mantle part (13) and the core (21), 81) is arranged which radially insert into the column (5) so that in the area of the constellation contour (40) a circular column (5) with variable column height (5b) results. At least one star contour (40) is formed as a separate ring flange (40a) with radial magnetic field concentrators (81).
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