PURPOSE: To provide a differential device with differential control function with a simple structure.

CONSTITUTION: A sub-gear 14 which is supported onto an outer periphery of one vehicle shaft 2R is connected to a main gear 10 provided on a differential case 6 of a differential device D, and rotated in the same direction as the main gear 10 with the same rotational speed. A first rotational body 151 and a second rotational body 152 are supported onto the outer periphery of the vehicle shaft 212, respectively through one-way clutches 161, 162. The first rotational body 151 are rotated with the speed higher than that of the sub-gear 142 concretely 1.3 times thereof. The second rotational body 15, is rotated with the speed lower than that of the sub-gear 14, concretely 0.7 times thereof. In the case that the rotational speeds of the vehicle shafts 2L, 2R range between 0.7 and 1.3 times of that of the sub-gear 14, the one-way clutches 161, 162 are engaged with each other to regulate function of a differential device D.