The present invention relates to a dual mass fly wheel comprising: a first fly wheel unit to be axially rotated with a crankshaft; a second fly wheel unit to be axially rotated with a transmission input shaft; a damping unit to deliver the torque of the first fly wheel unit to the second fly wheel unit; and a stopper to support the damping unit. The second fly wheel unit comprises: a second mass to be relatively rotated to a first mass around the same axis as the first mass; a spline hub integrated with the second mass around the rotation center of the second mass; and a driving member extended from one side of the second mass in the radial direction and integrated with the second mass. Therefore, the dual mass fly wheel reduces the production cost by reducing the number of components and simplifies the production process.;COPYRIGHT KIPO 2015
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