To solve problems in that a tricycle or the like for a physically chal lenging person is driven by turning drive wheels in a forward-bent posture but it is not easy to change the grip on the turning wheels, a trouble of non- driving of the drive wheels occurs since a handle is operated with a hand off the drive wheels when steering the tricycle, and a chain-drive system of turning a drive handle by hands is less easy, in particular, with difficulties on an uphill road, and the tricycle cannot be steered easily similar to the former systems.

Reels 1 and 2 are provided on one side of a tricycle body, a transmission belt 3 is wound therearound, U-shaped drive rods 4 are provided and one of them is pivotably supported in a longitudinally movable manner, the drive wheels 7 and 7 having a uni-directional clutch and drive wheels 8 and 8 are provided in the longitudinally movable portion of the driving rod 4, and drive the transmission belt 3 to allow the tricycle to move. A handle-type steering means is added to the drive rod 4, the steering means is connected to a steering wheel 19, and the handle 11 is longitudinally driven to allow the tricycle to be traveled, turned and steered.