A radial direction controller that is applied to a magnetic bearing apparatus that supports a rotating body to be levitated by at least an electromagnet (4a, 5a), comprising: a radial control circuit that controls the displacement of the axis (Ax) of the rotating body in the radial direction; a negative bearing stiffness elimination circuit that is connected in parallel with the radial control circuit, and that outputs a signal related to negative bearing stiffness; characterised in that the radial direction controller further comprises: a current value command device (61, 62, 63, 64) that outputs a current value for controlling the electromagnet, on the basis of a signal outputted by the radial control circuit and the signal related to the negative bearing stiffness outputted by the negative bearing stiffness elimination circuit; a DC component extraction device (76, 77, 78, 79) that extracts a DC component from the current value outputted by the current value command device; a correction coefficient calculation device (81, 82, 83, 84) that calculates a correction coefficient on the basis of the DC component extracted by the DC component extraction device and a bias current for the electromagnet; and a coefficient multiplication device (55, 56, 57, 58) that multiplies the signal outputted by the negative bearing stiffness elimination circuit by the correction coefficient calculated by the correction coefficient calculation device. a radial control circuit that controls the displacement of the axis (Ax) of the rotating body in the radial direction; a negative bearing stiffness elimination circuit that is connected in parallel with the radial control circuit, and that outputs a signal related to negative bearing stiffness; characterised in that the radial direction controller further comprises: a current value command device (61, 62, 63, 64) that outputs a current value for controlling the electromagnet, on the basis of a signal outputted by the radial control circuit and the signal related to the negative bearing stiffness outputted by the negative bearing stiffness elimination circuit; a DC component extraction device (76, 77, 78, 79) that extracts a DC component from the current value outputted by the current value command device; a correction coefficient calculation device (81, 82, 83, 84) that calculates a correction coefficient on the basis of the DC component extracted by the DC component extraction device and a bias current for the electromagnet; and a coefficient multiplication device (55, 56, 57, 58) that multiplies the signal outputted by the negative bearing stiffness elimination circuit by the correction coefficient calculated by the correction coefficient calculation device. a current value command device (61, 62, 63, 64) that outputs a current value for controlling the electromagnet, on the basis of a signal outputted by the radial control circuit and the signal related to the negative bearing stiffness outputted by the negative bearing stiffness elimination circuit; a DC component extraction device (76, 77, 78, 79) that extracts a DC component from the current value outputted by the current value command device; a correction coefficient calculation device (81, 82, 83, 84) that calculates a correction coefficient on the basis of the DC component extracted by the DC component extraction device and a bias current for the electromagnet; and a coefficient multiplication device (55, 56, 57, 58) that multiplies the signal outputted by the negative bearing stiffness elimination circuit by the correction coefficient calculated by the correction coefficient calculation device.