To provide a driving force distribution device capable of avoiding damage to each gear by reverse input torque.

A torque limiter 70 capable of transmitting torque within a predetermined torque range beforehand set is provided in the middle of a torque transmission system from a motor to first and second output shafts, more specifically, between a first sun gear 45 forming a planetary gear mechanism and a third sun gear 56 forming a transmission mechanism. The torque limiter 70 is constructed of a friction clutch which comprises a shaft-shaped part 71 formed on the third sun gear 56, a cylindrical member 72 connected to the first sun gear 46 and arranged coaxially and radially outside the shaft-shaped part 71, and an intermediate member 73 interposed between the shaft-shaped part 71 and the cylindrical member 72 and frictionally engaging with shaft-shaped part 71.