PROBLEM TO BE SOLVED: To provide an agricultural working machine favorably performing work for forming subsequent ridges and ridge-related work without breaking a trencher groove formed by preparation work.SOLUTION: The agricultural working machine is such that a long root vegetable working device 11 including a ridge formation part 13 forming ridges on a deep groove and a ridge-related work part 14 for performing work for seeding or transplanting long root vegetables on a ridge surface, is connected to the rear part of a tractor travelling along the deep groove linearly dug continuously, via a link mechanism 10. In the machine, disks 40, 40 the faces of which are along a travelling direction are set to the working device 11 and thereby the disks 40, 40 bite into the soil and go ahead to maintain straight-ahead travelling even though the long root vegetable working device 11 tries to wind its way because of interlocking with some steerage at the side of the tractor.
