To provide a testing machine for a bearing, in which a rotational speed cab changed in a wide range without attenuating a rotating torque when the performance of the bearing is tested, in which a thrust load and a radial load can be given to a shaft and in which the bearing can be tested by giving an offset load or a swiveling load in the radial direction.

A testing machine for a bearing is provided with a support shaft 2 which is maintained in a levitation state by an air bearing, which a housing base 3 and a housing 31 which are fixed onto the support shaft, which a fixation part which is composed of a rotating torque sensor 8 and which a magnetic member 51. It is composed of an outside rotor 5 which is turned by a motor M and of an inside rotor 4 which is situated in the inside space part of the outside rotor 5 and which is driven so as to follow the outside rotor 5 by a magnetic member 41.