To independently control an object for control, to be damped with high performance in three degree of-freedoms in the horizontal direction while decreasing the number of sensors and actuators as much as possible.

This device has horizontal vibration sensors 1', 2', 3' and 4' and horizontal displacement sensors 1'', 2'', 3'' and 4'' for detecting the horizontal vibration and displacement of a controlled system 9 to be de-excited as well as plural horizontal actuators 1, 2, 3 and 4 for injecting a horizontal manipulated variable (u) through a control system 10 based on detected amounts from the horizontal vibration sensors and the horizontal displacement sensors. The respective sensors and actuators are respectively practically positioned at four corners A, B, C and D and the detecting direction of respective sensors and the manipulated variable generating direction of actuators are provided point- symmetrically while being orthogonal with a straight line L connecting the center point O in the horizontal direction of the controlled system with four corners.