<p>A work vehicle capable of stably working and traveling by suppressing the effect of load variation such as dashing caused by the operation of a ground work machine. The work vehicle comprises a control part controlling the variator ratio of a toroidal mechanism for vehicle speed control positioned on a load resisting side when the load is applied to the output side of the toroidal mechanism. The control part controllably changes the variator ratio in connection with the start of the working of the ground work machine.</p>
