ELECTRONIC KEY, VEHICLE-MOUNTED DEVICE, GUIDANCE DEVICE, AND CAR-FINDER SYSTEM

An electronic key capable of using a simple system configuration to report information pertaining to a vehicle parking or stopping position. An electronic key (300) is an electronic key used to lock and unlock a vehicle (500) and has an electronic-key-side reception unit for receiving, from a vehicle-mounted device (200) mounted in the vehicle (500), vehicle-position information indicating the position at which the vehicle (500) is parked or stopped; an electronic-key-side memory unit for storing the received vehicle-position information; and an electronic-key-side transmission unit for transmitting the vehicle-position information to a guidance device (400) capable of presenting position information.