PURPOSE: To provide a vibration insulating mechanism which is used in the seat of an automobile and the base body of a building and designed to perform extremely efficient absorption of vibration.

CONSTITUTION: A lower oil damper 20 is attached on a lower base body 10 and the lower end of a rod 27 is coupled to a piston 25 arranged in the tank 19 of the lower oil damper 20. The upper end of the rod 27 is extended through an intermediate plate 34 and coupled to the tank 45 side of an upper oil damper 44. A piston 47 is arranged in a tank 45 and the upper end of a rod 49 to which the lower end of the piston 47 is coupled is attached to a base body 54 located thereabove. Support bodies 38 and 38 are protruded in right and left positions from the lower base body 10 with a slight distance between the lower oil damper 20. Rods 41 and 41 are protruded from the support bodies 38 and 38 toward the intermediate plate 34 and coupled through rubber pads 43 and 43.