The brake force regulator is provided with: a braking device (7), which is able to individually adjust the braking forces generated at each wheel (3) of a vehicle (2); and a control device (8), which controls the braking device (7) and is able to execute brake force distribution control that controls the braking forces of the left and right wheels (3) of the vehicle (2) individually so that the slippage between the left and right wheels (3) is equalized. Because the control device (8) is characterized in executing brake force distribution control on the basis of the upper limit of the change rate for the left-right braking force difference, which is the difference in braking forces of the left and right wheels (3), the brake force regulator achieves the effect of being able to stabilize the behavior of the vehicle (2).