To provide a differential device having a simple sealed structure without increasing cost.

This differential device is provided with a differential gear mechanism 53 comprising a differential case 55 in which lubricating oil is filled, a pinion gear 67 rotatably supported in the differential case 55, and a pair of output side side gears 71, 73 connected to each other through the pinion gear 67, and a differential limiting mechanism 79 to limit differential motion of the differential gear mechanism 53. In this case, a seal ring 83 to prevent leak of the lubricating oil outside the differential case 55 is disposed on a thrust block 81, and a seal ring 85 is disposed on the differential case 55.