To provide a mounting structure for bolting a bracket 1 for holding a center bearing support to a vehicle body side 21 via a vibration-isolating bush 11 which is simple in structure of the vibration-isolating bush 11, and capable of reducing the cost for components, and preventing bush bodies 12, 13 from being dropped from the bracket 1 before mounting the bracket 1 on the vehicle body side 21.

The vibration-isolating bush 11 comprises a pair of rubber-like elastic bush bodies 12, 13 for holding an opening circumferential edge of a mounting hole 1a formed in the bracket 1, and a collar 14 to be assembled to inner circumferential sides of the bush bodies 12, 13 in a non-adhesive manner. A clamping margin is set between the bush bodies 12, 13 and the collar 14, and reinforcing rings 16, 17 formed of a rigid material such as a metal are embedded in a clamping margin setting parts 12a, 13a.

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