A damping device attachable to a structure body of an object of which a vibration is to be reduced, the device comprising: a plurality of vibration detection means for detecting a vibration of a portion of the object; a plurality of vibration generation means for generating a distortion on a portion of the object; control means for generating a control signal determining a driving force of the vibration generation means by a signal from the vibration detection means; and signal input and output means for performing transferring of a signal with the control means, characterized in that a driving force generation signal is received from the outside through the signal input and output means, the driving force corresponding to the driving force generation signal is generated by the control means, and a selected vibration generation means is driven by the driving force, and vibration state information obtained from a selected vibration detection means is output from the control means to the outside through the signal input and output means, the damping device further comprising: signal analyzing means which is provided ahead of the signal input and output means; and a display device which displays a calculation result by the signal analyzing means, wherein transfer characteristics from the driving force generation signal to the vibration state information are calculated based on the driving force generation signal and the vibration state information, and the result of the calculation is displayed on the display device. a plurality of vibration detection means for detecting a vibration of a portion of the object; a plurality of vibration generation means for generating a distortion on a portion of the object; control means for generating a control signal determining a driving force of the vibration generation means by a signal from the vibration detection means; and signal input and output means for performing transferring of a signal with the control means, characterized in that a driving force generation signal is received from the outside through the signal input and output means, the driving force corresponding to the driving force generation signal is generated by the control means, and a selected vibration generation means is driven by the driving force, and vibration state information obtained from a selected vibration detection means is output from the control means to the outside through the signal input and output means, the damping device further comprising: signal analyzing means which is provided ahead of the signal input and output means; and a display device which displays a calculation result by the signal analyzing means, wherein transfer characteristics from the driving force generation signal to the vibration state information are calculated based on the driving force generation signal and the vibration state information, and the result of the calculation is displayed on the display device. signal analyzing means which is provided ahead of the signal input and output means; and a display device which displays a calculation result by the signal analyzing means, wherein transfer characteristics from the driving force generation signal to the vibration state information are calculated based on the driving force generation signal and the vibration state information, and the result of the calculation is displayed on the display device.