PROBLEM TO BE SOLVED: To provide a working machine capable of suppressing roughening of a field caused by an inside rear wheel in gyration, reducing oscillation of an implement connected to the machine and improving operability of a vehicle and durability of a connection mechanism of the implement. SOLUTION: The working machine includes a traveling body 2, front wheels 10, rear wheels 11, a driver's seat 31, a steering wheel 34, steering mechanisms (86I, 180, 217) to change the direction of the front wheels 10 in conjunction with operation of the steering wheel 34, a seedling planting part 4 liftably attached to the back of the traveling body 2 through a lift link device 3, and a controller 163 having an irregular on/off control function B to irregularly and intermittently connect and disconnect the driving power of the rear wheel 11 of inner side of gyration in conjunction with the motion of the steering mechanisms (86I, etc.). The inside rear wheel 11 is irregularly and intermittently driven in gyration of the vehicle to prevent resonance of a structure on the traveling body 2 with the driving force of the rear wheel 11, and to suppress the oscillation and vibration of the traveling body 2 keeping good working environment of the operator. COPYRIGHT: (C)2011,JPO&INPIT
