A swing arm suspension for reducing the number of parts to thereby reduce the number of man-hours for assembly, the weight and the cost. The swing arm suspension includes a pivot plate provided with a pivot shaft, a swing arm having a rear end portion supporting a rear wheel that is swingably mounted at a front end portion to the pivot shaft and a shock absorber that is mounted at an upper end portion to the swing arm and connected at a lower end portion through a link mechanism to a portion of the pivot plate at a lower level than the pivot shaft. An exposing portion is provided for exposing a shock absorber arrangement space to an upper space above the swing arm. At least one of a subtank and an adjuster as functional components of the shock absorber is located in the exposing portion.