The invention relates to an adjusting device for a prosthetic device, having a drive (1) for adjusting at least one first component of the prosthetic device relative to a second component, wherein the drive (1) is designed as a permanent magnet electric motor and comprises a stator (4) having exciter coils (3) and a rotor (2) having at least one permanent magnet is an armature magnet (5). At least one holding magnet (6) in the form of a permanent magnet is arranged on the stator (4) to form a cogging torque for the rotor (2).