To provide a driving force distribution device simplifying assembling work and reducing cost thereof by reducing the number of part items.

The device includes a differential mechanism 2; a differential limiting mechanism 3 including a friction clutch for limiting the differential of the differential mechanism 2; a control mechanism 4 including an electromagnet 4A for generating an electromagnetic force for controlling the limiting mechanism 3; a housing case 5 which houses the control mechanism 4, the limiting mechanism 3 and the differential mechanism 2; a holding member 6 which is fixed to the housing case 5 and includes a first holding part 602 for holding the electromagnet 4A of the control mechanism 4 and a second holding part 603 for holding an internal gear 2D of the differential mechanism 2 in a rotatable manner.