To prevent deterioration of steering performance of a vehicle due to a support roller.
An over fence working vehicle 1 includes rotatable and steerable front wheels 3 provided in a front side of a vehicle body 7, rotatable rear wheels 4 provided in a rear side of the vehicle body 7, a front jack 20 mounted on left and right both sides of the vehicle body 7 between the front wheel 3 and the rear wheel 4 and provided with the support roller 21 rotatable around a horizontal center axis line and rotatable around a vertical center axis line in a lower part, a rear jack 30 mounted on left and right both side in rear side of the rear wheel 4 of the vehicle body 7 and provided with the support roller 21 rotatable around the horizontal center axis line in a lower part, a boom 11 provided on the vehicle body 7, and a working stand 17 attached on a tip of the boom 11. The over fence working vehicle 1 travels by drive of the rear wheels 4 under condition that the support roller 21 is grounded while the front wheels 3 and the rear wheels 4 are grounded and that the vehicle body 7 is supported by the jacks 20, 30.