In the control device for vehicles which executes a control of the vehicle by one calculation control device based upon a target control amount generated by another calculation control device connected to the one calculation control device by way of a communication means, the other calculation control device calculates an estimated target control amount by itself to compare it with the target control amount generated by the one calculation control device and input thereto by way of the communication means, or a third calculation control device compares the target control amounts generated by the one and the other calculation control devices and input thereto by way of the communication means, thereby to judge if an abnormality has occurred in the communication means, and to rapidly modify the control to make a counter-measure against the abnormality.