PURPOSE: To simplify the assembling and miniaturizing a tire house by providing a side wall around a rubber mount bracket mounting the upper end of a cusion damper and, on the side wall, supporting the base end of the upper arm.

CONSTITUTION: A hub carrier 2 rotatably supporting wheels 1 are rotatably supported by respective tips of upper and lower arms 3, 4 at the upper and lower ends thereof. In this case, there is mounted a side wall 7 on a rubber mount bracket 6 mounted on the vehicular body 5. On the side wall 7, the base of the upper arm 3 is rotatably supported by a supporting shaft 10. Meanwhile, the base of the lower arm 4 is mounted on the vehicular body 5 through the bracket 11. Further, in a cusion damper 12, the lower end and the upper end are mounted to the lower arm 4 and the metal fitting 8 of the rubber mount bracket 6, respectively. In the rubber mount bracket 6, there is previously mounted the upper end of the cusion damper 12 and the base end of the upper arm 3.