PROBLEM TO BE SOLVED: To provide a tractor mounted with an onion processor which can perform processing of removing leaves and roots of onions while moving (changing a place) by the tractor itself in a field and which has excellent usability in a whole configuration.SOLUTION: An onion processor Z arranges thereon a leaf cut unit and a root cut unit in the front/rear continuously in a machine body case 1 having a long front/rear length compared to a right/left width. The tractor mounted with an onion processor includes the onion processor mounted on a machine body placement base Y connected to a rear part of a vehicle body of a tractor X and the tractor mounted with an onion processor can perform processing of cutting leaves and roots of onions in the onion processor Z while moving with the tractor X in a field. Accordingly, the tractor mounted with an onion processor can perform the processing of removing leaves and roots of onions while moving (changing a place) in the field by itself. Since the onion processor Z is mounted on the machine body placement base Y in such a posture that is long in a perpendicular direction to a travel direction of the tractor X, the tractor mounted with an onion processor can have a short front/rear length. The cut leaves and roots having been cut from the onions with the onion processor Z on the machine body placement base Y can be dropped to the field as they are.SELECTED DRAWING: Figure 1