To provide a mounting structure of an upper support having excellent assembling property to a vehicle body while materializing further cost reduction by reducing the required number of vulcanized articles made of rubber.

In the mounting structure of the upper support 18, the upper support 18 is fitted and mounted into a fit-in recess 26 formed in a vehicle body panel 20. A rebound stopper rubber part 80 is molded integrally with a main body rubber part 46 of a support body 28. In addition, a peripheral edge part of an opening 36 in the vehicle body panel 20 is made to be a upwardly bent part 92. The support body 28 is upwardly fitted into the fit-in recess 26. At the same time, the rebound stopper rubber part 80 is assembled in the vehicle body panel 20.