A supporting/moving section for supporting and moving a device to predetermined positions at which radiation imaging is performed is prepared. An operating portion is provided for manipulating the movement of the device supported by the supporting/moving means. A detecting section outputs detection signals, which are obtained by detecting external forces which are applied to the operating portion. A control section controls the supporting/moving means to move the device such that the movement tracks target values for movement, which are determined from the detection signals. During manipulation of the operating portion, a unique oscillation frequency measuring section executes measurements to obtain a unique oscillation frequency of the device. A unique oscillation attenuating section attenuates signal components, which are included in control signals output by the control means to control the supporting/moving means and cause the movement of the device to fluctuate at the unique oscillation frequency, in real time.