Suspension system for a three wheeled vehicle

In the invention, a differential mechanism 172 is arranged below an infinitely variable transmission 78 and a reduction gear mechanism 238, front fitting parts 71a, 72a and rear fitting parts 71b, 72b, for fitting suspension arms to a vehicle frame are arranged to the front and rear of the differential mechanism 172. Even though the left and right suspension arms swing up and down, or a transmission and a reduction gear mechanism attached on a vehicle frame swing left and right with respect to the suspension arms, there is no interference of the transmission and the reduction gear mechanism with the suspension arms due to a space at the front and the rear of a differential mechanism, so that the vehicle frame can swing left and right and it is also possible to easily constitute a vehicle having an independent suspension.