A remote control system includes an in-vehicle controller that is installed in a vehicle and controls in-vehicle devices installed in the vehicle; a mobile communication device that remotely controls the in-vehicle devices via the in-vehicle controller; and a wireless communication device that is installed in the vehicle and intervenes and establishes wireless communication between the in-vehicle controller and the mobile communication device, wherein the wireless communication device includes a reception-mode switching unit that switches between a reception standby mode with consumption of a standby current to prepare for reception from the mobile communication device and a reception dormant mode without consumption of a standby current in accordance with a time schedule.