To provide a vibration-proof device having a structure for preventing the unexpected displacement of a stopper rubber, in the vibration-proof device comprising the stopper rubber in a clearance A between inner and outer cylinders, and exercising the vibration damping function by the collision of the stopper rubber and the inner cylinder.

In this vibration-proof device wherein two clearances are formed by mounting the outer cylinder, the inner cylinder fitted to the outer cylinder and rubber elastic members mounted between the outer cylinder and the inner cylinder, and the inner cylinder and the outer cylinder are mounted on a vibration generating source and a frame body, at least one of the clearances comprises the stopper rubber from an outer cylinder side toward an inner cylinder side in a state of forming a gap a at its top part, and comprises a stopper from the inner cylinder side toward the outer cylinder side in a state of forming a gap b, and the gap a is smaller than the gap b.