PROBLEM TO BE SOLVED: To provide an agricultural machine transmission having high cooling efficiency.SOLUTION: An agricultural machine includes a three-point link hitch mechanism 2, a transmission gear box 3 receiving power from a PTO shaft of a tractor, and a rotary working part 4 having plowing blades 12 attached around the shaft periphery of a rotating shaft 11 extending in a horizontal direction. The transmission gear box 3 has a drive shaft 17 and a driven shaft 18. Gearshifts 191 and 192 are provided at the rear end side of the drive shaft 17 and the driven shaft 18 in an insertable and replaceable manner. Power is transmitted from the drive shaft 17 to the driven shaft 18 to perform tillage or mowing work. The agricultural machine includes an oil stirring member 26 attached to the drive shaft 17 or the driven shaft 18, an oil stirring cooling support case 5 forming a space for receiving oil along with the transmission gear box 3, and heat radiation fins 6 provided on an outer surface of the support case 5.SELECTED DRAWING: Figure 1
