To provide an agricultural working machine capable of transferring itself along the ridges of a plowed field, etc., and performing works in a comfortable posture.

This agricultural working machine 1 of which major parts are made of aluminum, has a light weight and therefore is handled easily. Also, the distances between front wheels 5, 6, rear wheels 13, 14 and the front and rear wheels can be adjusted. Further, the height of frames 15, 16 supporting a shelf can be adjusted. Therefore, it is possible to adjust the distances between the front wheels and between the rear wheels so as to fit to the distance of the ridges, etc., of the plowed field, and the distance between the front and rear wheels and the height of the shelf to a length suiting to the body shape of the worker. Thus, it is possible to perform agricultural works in a comfortable posture.