Apparatus for controlling a drive source brake force to be applied to a hybrid drive vehicle including an engine, an electric motor, and a transmission, the apparatus including a manually operated member for selecting one of different degrees of application of a drive source brake to the vehicle, an electric generator driven by a kinetic energy of the vehicle to generate an electric energy and apply as the drive source brake a regenerative brake force corresponding to the generated electric energy to the vehicle, and an electricity generation control device for controlling the electric energy generated by the electric generator, depending upon the selected degree of the drive source brake application. The apparatus may include a shift control device for changing the speed ratio of the transmission so that an engine brake force produced by the engine as the drive source brake is controlled depending upon the selected degree of the drive source brake application. The regenerative brake or engine brake is selectively applied depending upon the electric energy amount stored in an electric energy storage device.