To provide a driving force distribution control device of a four-wheel-drive vehicle capable of enhancing the steering stability by bringing the actual yaw rate of the vehicle close to the target yaw rate in a traveling situation in which the deviation of the yaw rate is increased while the difference in the rotational speed between front and rear wheels is hardly generated.

The driving force distribution control device of the four-wheel-drive vehicle has a driving force distribution control means for performing the control of increasing the distribution of the driving force to a sub driving wheel as the difference in the rotational speed between front and rear wheels is large while one of the front and rear wheels is a main driving wheel, and the other is a sub driving wheel. A threshold setting means (Step S4) is provided, which sets the threshold C by a large value as the yaw rate deviation ΔΨ between the absolute value abs.(Ψ*) of the target yaw rate Ψ* and the absolute value abs.(Ψ) of the actual yaw rate Ψ is larger. The driving force distribution control means sets the value of the detected value ΔNfr of the difference in the rotational speed between front and rear wheels with the threshold C added thereto to be the controlled value of the difference in the rotational speed between front and rear wheels to be used in the control for the difference in the rotational speed between front and rear wheels.