It is aimed to simplify assembling of an insert metal fitting into a liquid-filled Vibration-isolating apparatus and to avoid products defection. A vibration-isolating apparatus comprises upper and lower metal fittings 2, 3; a vibration-isolating base body 4 connecting the upper and lower metal fittings 2, 3 and formed of an elastic material having rubber-like elasticity; and an insert metal fitting 8 embedded in the vibration-isolating base body 4; the insert metal fitting 8 being formed of a metal plate or sheet bent in an approximately U-shape. The insert metal fitting 8 including a pair of flat side-plate portions 32; and a connecting portion 31 connecting the upper ends of the side-plate portions 32. The connecting portion 31 is clamped between the upper metal fitting 2 and a screw head 9a of the mounting bolt 9 which bolt is upwardly inserted into the through hole from vibration-isolating base-body side of the connecting portion. Thus, the mounting of the insert metal fitting is simplified; coating of inner surface of the insert metal fitting 8 with adhesive is facilitated. Moreover, the flow-in property of rubber into the opening of the insert metal fitting 8 is improved.