When two kinds of tilling tines are selectively mounted, the present invention enables tilling performance to be favorably exhibited even when either of the tilling tines is mounted. This tilling tine arrangement structure for a tilling machine is provided with: a rotating shaft a plurality of flanges disposed at intervals in the axial direction of the rotating shaft and a mounting part for selectively mounting a plurality of first tilling tines or second tilling tines of a different type than the first tilling tines, wherein, in a state in which the plurality of first tilling tines are mounted on the plurality of flanges, the arrangement direction of the first tilling tines which are adjacent in the axial direction and have the same orientation differs from the arrangement direction of the second tilling tines which are adjacent in the axial direction and have the same orientation.
