To hardly cause the occurrence of racing to not only both sides but also the single side of right and left drive wheels, in an industrial vehicle to transmit rotation, outputted from a running drive source, to right and left drive wheels through a differentiating device.

Rotation outputted from an engine 1 to an output shaft 3b through a torque converter 2 and a transmitter 3 is transmitted to right and left drive wheels 5 and 5 through the differentiating device 4. Two vehicle speed sensors 17 and 17 are provided to individually detect the rotation speeds of the right and left drive wheels 5 and 5. A control device 41 individually determines the slips (a decision value (acceleration or deceleration)) of the right and left drive wheels 5 and 5 by using the detecting values of the vehicle speed sensors 17 and 17. When the large one of the two slips exceeds a threshold, slip prevention control (TRC control, ABS control, etc.), through which the engaging pressure of one to be connected of clutches 8 and 9 in a transmission 3 is weakened, is executed.