PURPOSE: To improve adjustment workability of a toe by constituting the base end part of a trailing arm so that it may be moved in a vehicle width direction by vertical oscillation, and increasing the degree of freedom in rear wheel toe change for the suspension stroke.

CONSTITUTION: A wheel supporting material 12 is supported by a vehicle body B through the first supporting member 3 of one rod type prolonged in a vehicle width direction. There is installed the second supporting member which constitutes a strut-type suspension between the wheel supporting material 12 and the vehicle body B. Also, there is mounted a trailing arm 4 with high rigidity extending in the front/rear direction of the vehicle body B between the wheel supporting material 12 and the vehicle body B. The front edge 48 (base end part) of the trailing arm 4 is provided with a moving mechanism 49. When used, the moving mechanism 49 moves the base end part of the trailing arm 4 in a vehicle width direction. As a result, the toe angle of the rear wheel to the vehicle body B displaces. It is thus possible to increase the degree of freedom in toe change and improve workability in alignment setting.