To prohibit undesired steering of a vehicle due to wrong operation of the steering.

A steering device of a working vehicle is equipped with actuators 9L and 9R for steering to fold the vehicle body 1, an operating member 12 to operate the actuators 9L and 9R, running intention determining means 22 and 23 to determine whether the driver etc. possesses a intention to run the vehicle, and steering control means 17 and 20 to prohibit the operation of the actuators 9L and 9R by the operating member 12 when the determining means 22 and 23 determine that the driver has no intention of running the vehicle, and when they determine that he has an intention, admit the operation of the actuators 9L and 9R by the operating member 12.