MOBILE FARM MACHINE

PROBLEM TO BE SOLVED: To enable the prevention of the changing of the rotary speed of an engine according to the change of load in the middle of work and the simplification of the operation for turnabout at a butt of a field. SOLUTION: This mobile farm machine carriers out agricultural work in a state where an output controlling member 63 for controlling the rotation of an engine 2 is placed and a working machine is furnished. The mobile farm machine is provided with an engine speed-setting dial 74 for initially setting the rotary speed of the engine 2 and an engine-rotation automatic switch 75 for automatically controlling an output-controlling member 63, which rotates the engine 2 according to the rotary speed set by the dial 74. Further, the mobile farm machine is provided with a controller 77 for automatically lowering the rotary speed of the engine 2 by releasing the rotary control, in which the rotary speed of the engine 2 is controlled according to the rotary speed set by the dial 74, through the operation of an accelerator for manually changing the rotary speed of the engine 2.