The invention relates to a magnetic actuator comprising a mobile magnetic part (4), a fixed magnetic part (5) and means for starting the displacement of the mobile magnetic part (4) with respect to the fixed magnetic part (5). The inventive actuator comprises at least two amagnetic supports (1, 2) arranged on the different planes, whereby forming a space (3) therebetween. The fixed magnetic part (5) is connected at least to one of the supports (1, 2). Each support (1, 2) is provided with a stop area (10, 20) for the mobile magnetic part (4) which is separated from the fixed magnetic part (5). The mobile magnetic part (4) is in levitation in the space (3) between two supports (1,2) as a result of a magnetic guidance produced by the fixed magnetic part (5) when it is not abutted against the stop area (10,20) of the supports (1, 2). The mobile magnetic part (4) is enable to take several stable magnetic positions when it is abutted against the supports (1, 2).