A liquid enclosing vibration isolating apparatus comprising: a first metal fitting (1) to be attached to one of bearing counterparts, a second cylindrical metal fitting (2) to be attached to the other of the bearing counterparts, an insulator (3) for connection between the first and second metal fittings (1, 2) in a vibration isolation state, a primary liquid chamber (5) using the insulator (3) as a portion of its wall and filled with a hydraulic fluid, a secondary fluid chamber (7) passing through Separating element (6) is separated from the primary liquid chamber (5) and having at least a portion of a wall formed by a membrane (10), wherein membrane (10) has a main body portion (41) and a thick outer peripheral portion (40), a throttle channel (8) formed in the partition member (6) to be interposed between the primary liquid chamber (5) and the secondary fluid chamber (7) to connect, and a portion of the second metal fitting (2), which forms an outer metal cylinder (11) which is associated with the periphery of the insulator (3), wherein the separating element (6) between the insulator ( 3) and the thick outer peripheral wall portion (40) of the diaphragm (10) is floatingly supported and the diaphragm is floatingly supported, while an elastic body defined by an extended portion (12) of the insulator (3) or a cylindrical portion (67) of the thick outer peripheral portion (40) of the diaphragm (10) is formed between the second metal fitting (2) and the separating element (6) is inserted to block the vibration transmission from the separating element (6) on the second metal fitting (2), wherein the thick outer peripheral wall portion (40) of the ...
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