In a vehicular brake force control apparatus, an engine brake force Feb is calculated; a road surface friction coefficient .mu. and a rear wheel degree of grip .epsilon.r is calculated; and a threshold value Ke is calculated such that the threshold value Ke increases as the road surface friction coefficient .mu. becomes smaller. When the rear wheel degree of grip .epsilon.r is smaller than the threshold value Ke, it is determined that vehicle behavior of a vehicle is liable to become unstable when the engine brake force Feb acts. In this case, a sum of the engine brake force Feb and a target friction brake force Fbv based upon a steering operation amount of a driver is distributed to each wheel in accordance with a distribution that stabilizes the vehicle behavior of the vehicle. Based on this distribution result, a friction brake force and an output torque of the engine are controlled.