An arrangement structure of a starter motor in an all-terrain vehicle in which a minimum road clearance is secured sufficiently and lowering of the center of gravity and adequate weight distribution of the vehicle can be achieved. The organizer having a pre-selected shape, such as a heart shape. The output voltage of the electric generator is supplied to the electric motor and the output of the electric motor drives the subordinate drive wheels. Alternator is disconnected by controller by running down prime mover, monitoring the current and stalling prime mover when the current flow is at a minimum.