To provide a brake control device capable of improving working efficiency in maintenance.

In calibration of the control origin on brake control, the control origin detected by operating a detecting means of a CPU of a master pressure control device is stored in a nonvolatile memory and a buffer memory by a control origin adjustment indication signal, and readout-selection of a selector means 302 is set on the buffer memory side. As a result, the new control origin by the calibration can be applied in real time to the brake control application 303. Thus, since there is no need to wait for time up to restarting by ON-OFF operation of an ignition switch as usual, the working efficiency of the maintenance can be improved.