To provide a vibration deadening control system wherein response to steeply changing vibration is improved, and the vibration deadening control system.

Between the base 12 and the water tub 14 of a washing machine 21, an electromagnetic type suspension constituted by combining a linear motor 1 and a spring is arranged, and a position sensor 8 is arranged in the moving component 7 side of the linear motor 1. When the phase is detected with a position calculating section 55 on the basis of the position signal output from a position sensor 8 and the speed v is detected with a differentiator 57, a controller 41 executes the vector control of the linear motor 1 on the basis of the phase , the speed v, motor currents Ia, Ib, Ic to suppress the vibration generated with the water tub 14 while washing operation is performed.