A magnetic suspending device which can detect the temperature of a controlled object and assure a safe operation thereof without any need for any special construction or work to the device and any special maintenance is disclosed. In the magnetic suspending device comprising a pair of electromagnets (11, 13) disposed opposite to each other, a magnetizable controlled object (15) disposed between the pair of electromagnets (11, 13) and position displacement detection sensors (12, 14) disposed opposite to each other for detecting a position displacement of the controlled object (15), wherein detection signals from the position displacement detection sensors (12, 14) are inputted to a control circuit unit (20) for performing phase compensation and gain adjustment, wherein control outputs from the control circuit unit (20) control magnetic attractive or repulsive forces of the pair of electromagnets (11, 13), and wherein the controlled object is magnetically suspended by the pair of electromagnets without contact at an arbitrary position, a temperature operational circuit unit (30) is provided for detecting the size and temperature of the controlled object (15) using the detection signals from the position displacement detection sensors (12, 14).