A vehicle control system includes a vehicle platform including a first computer configured to perform traveling control of a vehicle and an autonomous driving platform including a second computer configured to perform autonomous driving control of the vehicle. The second computer generates control instruction information with respect to the vehicle platform and the first computer performs the traveling control of the vehicle based on the control instruction information. The vehicle control system further includes a vehicle control interface configured to relay the control instruction information. The vehicle control interface prohibits the second computer from performing the autonomous driving control of the vehicle in a case where predetermined authentication information indicating that the autonomous driving platform is genuine is not received from the autonomous driving platform.