To easily change alignment by providing a support side mounting hole through which a pair of fixtures is inserted so as to clamp a mount center and providing a support side insertion hole so that a shaft center of a strut is positioned deflected from the mount center on a support member.

A pair of support side mounting holes 56, 56 arranged so as to clamp a mount center 40c of a strut mount 40 and to insert a pair of mounting bolts through it is formed on an outside portion 50-1a of a first support member. A support side insertion hole 58 is formed on a central portion 50-2a of a second support member so that the axial center 12c of a strut 12 is positioned deflected by a distance L from the mount center 40c out of a support side hole central connection A passing through each of support side hole centers 56c, 56c of a pair of the support side mounting holes 56, 56 and the mount center 40c. Consequently, it becomes easy to change required wheel alignment and to simplify a process at the time of assembling it in a plant.