(57) [summary] [purpose] and to improve the oil supply to the gear, and the like required lubrication part, which is housed in the differential case of the differential device, to prevent premature wear and seizure of gear tooth surface. [Configuration] on the inside of the differential case, in what is formed by disposing the pinions of the differential bevel gears and said bevel gear meshes connected to the axle shaft, the outer peripheral surface and the hub portion in the peripheral surface of the differential case of said axle shaft Between the oil passages of the annular extending axle shaft axial direction is formed, a portion at least of the inner circumferential surface of the hub portion to limit the outer circumferential surface of the oil passage, and a large-diameter end to the bevel gear side conical tapered face is formed with.
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