A differential device for a vehicle includes a differential casing 15, pinion shafts 25, 27 connected to through-holes of the differential casing 15, pinion gears 3 supported by the pinion shafts 25, 27, a differential mechanism 9 having side gears 5, 7 meshing with the pinion gears 3, a limited-slip differential 11 for limiting a differential rotation of the differential mechanism 9 and an actuator 13 for controlling the limited-slip differential 11. A ring gear is fixed on a flange part 17 of the differential casing 15. The flange part 17 is positioned on one side of the differential casing 15 in an axial direction of the differential casing disproportionately. The actuator 13 is arranged so as to abut on the flange part 17. The differential casing 15 is divided into casing pieces by a parting part 19 on one side of the differential casing 15 in opposition to the flange part 17 in the axial direction. The casing pieces are connected with each other by connecting members 21.