In an on-vehicle equipment remote control system provided with a portable unit that a vehicle operator can carry and an on-vehicle unit that executes a predetermined process if a code content of a response signal issued by the portable unit in response to a transmitted request signal matches a required code content, the on-vehicle unit transmits the request signal on a first frequency prior to the start of a vehicle power source and transmits the request signal on a second frequency that is higher than the first frequency after the start of the vehicle power source.