PURPOSE: To permit installation by preventing the resonance of a vibrationproof mount body by installing a serration part at a part on the shaft outer peripheral surface of an assembly bolt and installing a serration fitted part in a metal fitting center hole of one vibration control mount body.

CONSTITUTION: The nearly cylindrical vibration control mount bodies 30 and 40 are placed coaxially with a through hole 21 on both the surfaces of a plate-shaped supporting member 20. The one-sided metal fitting 31 of the mount body 30 has a disc-shaped part and a cylinder part 31a continuous to the disc-shaped part, and a small diameter fitting part 32 which is fitted with the serration part of a bolt is formed at a part of the center hole. As for an assembly bolt 60, a serration part 61 is formed at the fitting part of the vibrationproof mount body 30 so as to have the slightly larger diameter than other outside diameter, and after the top end is inserted into the center hole from the vibrationproof mount body 40 side, the head part 62 of the assembly bolt and the vibrationproof mount body metal fitting 31 are compressed, and at the same time, the serration part 61 is fitted with the fitting part 32. After the top end of the assembly bolt is inserted into the center hole 11 of a supported member, the vibrationproof mount assembly body is integrally screwed with the supported member 10 by an assembly nut 80.