PURPOSE: To reduce the noise confined in a car room by providing a weight in the middle of a mount main body made of an elastic body that forms an air chamber whose cross section is increased toward the lower part from the upper part of the mount main body.

CONSTITUTION: A mount main body 20 is made of rubber. The upper part is connected to the engine side by means of a mounting plate 22 and the lower part is connected to the car body side by means of a mounting plate 25, respectively. A weight 21 is fit in the middle of the mount main body 20 and an air chamber 29 whose cross section is increased toward the lower part from the upper part of the mount main body 20 is formed. As a result, since a spring constant can be increased in a low frequency region and can be decreased in a high frequency region by the resonnance effect of the air spring caused by the air chamber and the effect of the weight, the noise confined in a car room can be reduced.