A vehicle control device, comprising: a computing portion configured to output a plurality of control commands as serial data for controlling a functional portion which is provided in a vehicle; and a driver circuit configured to drive the functional portion in accordance with the control commands received as serial data from the computing portion, wherein the driver circuit is configured to perform a function which is statically implemented on the circuit in advance, wherein the computing portion transmits diagnosis data to the driver circuit as the control command, wherein the driver circuit transmits inverted diagnosis data in which at least a part of the diagnosis data received from the computing portion is bit-inverted, to the computing portion, and wherein the computing portion diagnoses whether or not the computing portion and the driver circuit normally communicate with each other, by using the diagnosis data output to the driver circuit and the inverted diagnosis data which is received from the driver circuit, wherein the vehicle control device further comprises: a transmission wiring configured to propagate a signal transmitted from the computing portion to the driver circuit; and, a reception wiring configured to propagate a signal transmitted from the driver circuit to the computing portion, wherein the driver circuit is configured to perform an operation of communicating with the computing portion via the transmission wiring, and an operation of communicating with the computing portion via the reception wiring asynchronously, and wherein operation data which shows the operation result of the functional portion and the inverted diagnosis data are transmitted to the computing portion via the reception wiring. a computing portion configured to output a plurality of control commands as serial data for controlling a functional portion which is provided in a vehicle; and a driver circuit configured to drive the functional portion in accordance with the control commands received as serial data from the computing portion, wherein the driver circuit is configured to perform a function which is statically implemented on the circuit in advance, wherein the computing portion transmits diagnosis data to the driver circuit as the control command, wherein the driver circuit transmits inverted diagnosis data in which at least a part of the diagnosis data received from the computing portion is bit-inverted, to the computing portion, and wherein the computing portion diagnoses whether or not the computing portion and the driver circuit normally communicate with each other, by using the diagnosis data output to the driver circuit and the inverted diagnosis data which is received from the driver circuit, wherein the vehicle control device further comprises: a transmission wiring configured to propagate a signal transmitted from the computing portion to the driver circuit; and, a reception wiring configured to propagate a signal transmitted from the driver circuit to the computing portion, wherein the driver circuit is configured to perform an operation of communicating with the computing portion via the transmission wiring, and an operation of communicating with the computing portion via the reception wiring asynchronously, and wherein operation data which shows the operation result of the functional portion and the inverted diagnosis data are transmitted to the computing portion via the reception wiring. a transmission wiring configured to propagate a signal transmitted from the computing portion to the driver circuit; and, a reception wiring configured to propagate a signal transmitted from the driver circuit to the computing portion, wherein the driver circuit is configured to perform an operation of communicating with the computing portion via the transmission wiring, and an operation of communicating with the computing portion via the reception wiring asynchronously, and wherein operation data which shows the operation result of the functional portion and the inverted diagnosis data are transmitted to the computing portion via the reception wiring.