To provide a tricycle which allows to dispense with providing the mechanism to absorb fluctuation of the center distance relative to the rear wheel shaft while suppressing transmission of the vibration from the rear wheel to the rear seat to the minimum.

The tricycle is coaxially provided with an input shaft 21 to which the driving force transmitting to a pair of right and left rear wheels 2, and an oscillating central shaft 24 oscillatingly supporting a rear wheel shaft. Therefore, a suspension mechanism can be mounted so that the rear wheels 2 oscillate with the oscillating central shaft 24 serving as the center, and the mechanism to absorb the fluctuation of the distance of the relative position between the transmission gears 27A, 30A, 27B, 30B is dispensable. The manufacturing cost can be reduced as a result.