<p>A stabilizer controller for transmitting power via a reducer can suppress roll movement of the car smoothly and quickly without being influenced by the transmission efficiency of the reducer. A stabilizer (SBf) has a pair of stabilizer bars (SBfr, SBfl) provided between left and right wheels and a stabilizer actuator (FT) provided between the stabilizer bars and used for driving an electric motor. The electric motor (M) is controlled according to the turning state of the car to control the torsion rigidity of the stabilizer. The stabilizer further has relative position detecting means for detecting the relative positions of the pair of stabilizer bars (for example, from the relationship between the rotational angle of the electric motor and the reduction ratio) so as to control the electric motor according to the detection results.</p>
