PURPOSE: To minimize a vibration control effect to large excitation input smoothly by using a fussy logic circuit to compute the increase/decrease amount of a regulator, and controlling vibration with a large vibration control effect efficiently at the time of small excitation input.

CONSTITUTION: This controller for vibration control device is provided with sensors 11a, 11b, 12a, 12b which detect vibration amount, a fussy logic circuit 4 which computes the increase/decrease amount of a vibration control effect command value based on the displacement and speed of an additional mass, a circuit 5 which computes a new vibration control effect command value based on the current vibration control command value and subtraction amount computed by the fussy logic circuit 4, a circuit 6 which computes feedback coefficient corresponding to the new vibration control command value, and a control circuit 7 which controls electric current to be supplied to a surbo valve 2 based on the feedback coefficient obtained by the feedback coefficient computation circuit and the displacement and speed of a structure. Besides, the fussy logic circuit 4 is designed so that increase speed of the feedback coefficient may become smaller than decrease speed.