A vehicle control system includes a vehicular device mounted to a vehicle and a mobile key carried by a user. The vehicular device includes: a vehicular device communication unit communicating with the mobile key, and an acquisition unit acquiring vehicle state information reflecting a state of the vehicle. The vehicular device communication unit transmits the vehicle state information to the mobile key. The mobile key includes: a mobile key communication unit communicating with an external device; an operation unit including operation buttons; and an information generation unit generating operation command information reflecting an operation command set for each of the operation buttons when the operation buttons are operated. The mobile key communication unit receives the vehicle state information. The mobile key further includes a setting unit setting the operation command for each of the operation buttons based on the vehicle state information.