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In this paper, the dynamic movement of a driveshaft with imbalance is calculated from the bending stress of a driveshaft at a vehicle test. The synthesis movement is simulated using vertical and horizontal bending models with the centrifugal force induced by the imbalance. Thus, the mechanism that bending stress arises at a driveshaft of a general power train is clarified. The analysis using the simulation shows the relationship between vertical and horizontal stiffness of a power train and dynamic movement of a driveshaft. As a result, a method to reduce bending stress of a driveshaft is proposed.