To provide a motor integrated magnetic bearing device capable of improving long-term durability of a roller bearing under a load of thrust loading and also capable of enabling the high-speed rotation of a main shaft.

The motor integrated magnetic bearing device uses roller bearings 15 and 16 jointly with a magnetic bearing, and the roller bearings 15, 16 support the radial load and the magnetic bearing supports either axial load or bearing pre-load or both. Two thrust plates 13a and 13b are disposed axially at a distance and the two thrust plates 13a and 13b have an electromagnetic target in one side and a permanent magnet 28aa for a motor rotor 28a in the other side. A motor stator 28b is arranged so as to be clipped by the permanent magnet 28aa. The motor 28 is an axial gap type coreless motor. The main shaft 13 is split into two between the two thrust plates 13a and 13b and both main shaft splits are united together.