Many biomechanical studies involving infant anthropometric dummies with a monolithic head part have been performed to clarify the mechanism underlying brain injury during shaking. However, using these dummies, it is not possible to visualize the relative rotational motion between the skull and brain that would directly rupture bridging veins during shaking. Therefore, we constructed an infant anthropometric dummy that had a realistically shaped physical model of an infant head to help visualize the relative motion between the skull and brain. As the results, significant rotational motions were observed between the skull and brain on violent shaking. The results showed the bridging vein stretch ratio exceeded the threshold for the rupture and indicated that change in rotational direction during shaking plays a more important role in ASDH than does the instantaneous peak angular acceleration.