PURPOSE: To operate an anti-skid brake automatically in a case in which a retarder is operated and vehicle wheels are locked, in the case of a vehicle brake force controller with an anti-skid brake and a retarder.

CONSTITUTION: Formation is conducted so that a vehicle wheel lock time retarder/anti-skid brake controlling means 9A that, when a vehicle wheel lock or quasi-lock state is detected, controls a retarder 7 so as to reduce brake force that is by means of the retarder 7 and at the same time conducts control so as to put an anti-skid brake into an operation state, may be equipped.