To provide a fluid filled vibration isolating device having novel construction for advantageously developing vibration isolating effects based on the flowing action of filled non-compressive fluid while effectively suppressing the occurrence of shocking abnormal noises and vibration.

In window portions 54, 68 formed on a wall portion of a storage space 78 of a partition member 40, at their portions located in opposition to the outer peripheral edge of a movable plate 80, a valve element 100 formed of an elastic material is arranged which is fixed to the partition member 40. On the other hand, at least the outer peripheral edge of the movable plate 80 located in opposition to the valve element 100 is formed of an elastic material and a cutout portion 104 is formed in the outer peripheral face of the movable plate 80. During the input of great amplitude vibration, the outer peripheral edge of the movable plate 80 is elastically deformed to abut on the valve element 100 and forcibly open the valve element 100, and then an opening passage 108 appears through a space to the movable plate 80 with the cutout portion 104.