a switched vibration isolator has an elastic base member fixed to a first fitting member , and a tubular member fixed the elastic base member . a partition device is disposed in the tubular member , and has an outer diameter , a first partition side opposing the elastic base member defining a main liquid chamber therebetween , and a second partition side opposite the first partition side . the partition device defines an orifice communicating with the main liquid chamber . a partition receiving plate has a diameter greater than an outer diameter of the partition device and the partition device is mounted thereon . a diaphragm is disposed opposing the partition receiving plate and defining an auxiliary liquid chamber communicated with the main liquid chamber via the orifice . the partition receiving plate and the diaphragm are fixed in place together by an end of the tubular member .