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1. A lubricating structure of a differential gear unit, comprising:
a pair of side gears that oppose each other and are fixed to a pair of drive shafts that are spaced apart and aligned with each other; a pair of pinions that are in mesh with the pair of side gears, in between the pair of side gears; a differential case that rotatably supports the side gears and the pinions about respective axes thereof, and that rotates the pair of side gears about the axis thereof while allowing differential rotation between the pair of side gears; a differential housing that rotatably supports, about an axis that matches the axis of the pair of side gears, the differential case via bearings arranged around the pair of drive shafts, a first chamber space being formed between the differential case and the differential housing, a second chamber space being formed around one of the drive shafts by an oil seal, the differential case, the differential housing, and one of the bearings, and a third chamber space being formed by the differential case, the pair of side gears, and the pair of pinions; and a first lubricating oil supplying device that supplies lubricating oil to the second chamber space, wherein a smallest passage sectional area of a lubricating oil flow path that leads from the second chamber space to the first chamber space through the one bearing is configured to be smaller than a smallest passage sectional area of a lubricating oil flow path of the first lubricating oil supplying device; and a smallest passage sectional area of a lubricating oil flow path between the second chamber space and the third chamber space and a smallest passage sectional area of a lubricating oil flow path in the third chamber space are configured to be larger than the smallest passage sectional area of the lubricating oil flow path of the first lubricating oil supplying device.
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