Vibration reduction device

A vibration reduction device comprising:

• a support plate;
• a first side mass positioned at an edge of one side surface of the support plate;
• a second side mass disposed to be opposite to the first side mass and positioned at an edge of another side surface of the support plate;
• and
• an impact absorbing member coupled to the support plate and configured to come into contact with the first side mass or the second side mass,
• wherein the impact absorbing member comprises:
• a ring portion coupled to a coupling surface defined along a circumferential surface of the support plate adjacent to an inner-circumferential portion of the support plate, the ring portion having a smooth surface facing the first side mass or the second side mass;
• and
• a plurality of over-molding portions defined along an outer periphery of the ring portion,
• wherein a width between a center of one of the plurality of over-molding portions and a center of another adjacent one of the plurality of over-molding portions conforms to a width between left and right lower end edge portions of the first side mass or the second side mass, such that the one of the plurality of over-molding portions and the another adjacent one of the plurality of over-molding portions are in contact with the left and right lower end edge portions of the first side mass or the second side mass.