PURPOSE:To obtain an all-wheel drive type working vehicle capable of steering the front wheels and also of being turned quickly by using a system in which at the same time as the clutches of left and right-handed rear wheels are switched, the brake of the rear wheels is operated. CONSTITUTION:Power from an engine 7 is transmitted through transmission belts 9a and 9b to a front wheel differential 15 to allow the rear wheels 2 to be driven freely. The front wheels 1 are also allowed to be steered freely by a steering link 27 by means of the rotation of a steering wheel. A clutch 17a is provided in the power transmitter from the rear wheel differential 15 to each rear wheel 2. The clutch 17a is switched by stepping in the clutch pedal 22, and the brake 18 of each rear wheel 2 is operated through a sleeve 23. Safe quick turning is made possible by stopping the drive of the freely steering front wheels and rear wheels on the turning side and by operating the brake.