A vehicle control system includes an in-vehicle device and a portable device. The in-vehicle device includes an in-vehicle communication portion. The in-vehicle communication portion transmits a regular collation signal searching the portable device, and receives a regular response signal, and receives reservation information reserving opening of an arbitrary door. The in-vehicle device includes a collation portion that collates an ID code with a master code. The in-vehicle communication portion transmits an event collation signal, and receives an event response signal. The collation portion collates the ID code with the master code. The in-vehicle device includes an output portion and an intention determination portion. The portable device includes a portable device communication portion and an operation portion and a storage portion and a notification portion. The portable device communication portion transmits the regular response signal, and transmitting the reservation information. The portable device communication portion transmits the event response signal.