To provide a thrust magnetic bearing device which generates magnetic attraction force in both directions (one direction and the other direction of thrust direction) by an integral electromagnet.

A magnetic path is switched depending on whether a magnetic path change pipe 26 is provided between a shaft end part 21a and an iron core 24 of the electromagnet to generate magnetic attraction force in two directions for a thrust disc 22. Furthermore, the magnetic path change pipe is moved by an actuator. Or, when the thrust disc leans to one side or the other side, the direction of generation of magnetic attraction force for the thrust disc is switched by change of positional relation of the shaft end part and a magnetic path change part provided in the iron core of the electromagnet (whether both of them are overlapped or not). Or, when tip faces of two thrust discs oppose to both end faces of the iron core of the electromagnet and the thrust disc is displaced in the direction of thrust, restoration force for making a gap between the thrust disc and the iron core of the electromagnet minimum acts.