ELECTRONIC DEVICE AND ELECTRONIC SYSTEM

A vehicle-mounted device 100 that is capable of attaching and detaching a portable device 10 including a rechargeable battery 15, and supplies an electric power to the portable device 10 in a attachment state where the portable device 10 is attached, the electronic device 100 characterized by comprising: a controller 140 that confirms completion of the operation of the portable device 10 when a power source of the electronic device 100 is turned off in the attachment state; and a voltage converting device 141 that stops supplying the electric power to the portable device 10 after the confirmation by the controller 140.