PURPOSE: To provide a magnetic bearing device which can be controlled even if a part of an insulated electric wire of a bearing coil is broken so that a rotary unit is not damaged.

CONSTITUTION: A magnetic bearing device is provided with a rotor yoke made of a magnetic material, fixed to a rotary shaft, an electromagnetic stator secured to a casing with a slight clearance between the rotor yoke and the same, and a deviation sensor for measuring a deviation quantity of the rotary shaft. Magnetic force applying between the rotor yoke and the electromagnetic stator is controlled on the basis of a signal output from the deviation sensor so that the rotary shaft can be supported in magnetic non-contact. Bearing coils 15b, 16b are such constituted that a plurality of copper wires 41 electrically connected at both ends 100, 200 are wound around electromagnetic stators 15c, 16c.