PURPOSE: To provide a hydraulic lifting apparatus of a tractor, having an oil groove connected to a bush metal on a hydraulic arm shaft in axial direction, provided with an oil-feeding means for supplying a return oil of a control valve to the oil groove, effective for surely preventing the seizure of a bush metal and having excellent operability.

CONSTITUTION: A hydraulic arm shaft 7 having a pair of right and left lift arms 10 is mounted on a hydraulic housing 3 placed at the rear part of a tractor body 1 in a state to be freely rotatable around the axis via a bush metal 8 and the lift arms 10 are lifted or lowered by the operation of a control valve 4. An oil groove 14 connected to the bush metal 8 is formed on the hydraulic arm shaft 7 in axial direction and the return oil of the control valve 4 is supplied to the oil groove 14 with an oil-feeding means 18. Preferably, the oil- feeding means 18 has a piping member 17 connected to the returning part of the control valve 4, sprays the oil ejected through the piping member 17 to the inner surface of the hydraulic housing 3 and supplies the splashed oil to the oil groove 14.