PURPOSE: To prevent the generation of abnormal noise in a spline joint part by obtaining the nonuniform compression quantity in the free state of an elastic member positioned on both sides in the revolution direction of each revolution transmission projection of a hub, and setting the position of an elastic member having the larger compression quantity, different on the left and right sides.

CONSTITUTION: A plurality of revolution transmission projections 32 and 42 which project outwardly in the radial direction are formed on the outer peripheral parts of the hubs 30 and 40 which are two-piece divided in the axial direction. Rubber members 33 and 43 are vulcanized-joined on both the sides in the peripheral direction. Further, rubber members 34 and 44 and rubber member 35 and 45 are vulcanized-joined at the edge part in the radial direction and at both the edge parts in the axial direction. The spline holes 31 and 41 of the hubs 30 and 40 are formed with the phase deflection of θ, having the revolution transmission projections 32 and 42 as standard. Accordingly, an elastic member can provide a preload in both the revolution directions between a spline shaft and a spline hole, and the generation of abnormal noise due to the collision of the spline shaft and the hole can be prevented.