An electronic device having a detachable layered accessory case includes a communication unit, and a layered accessory case capable of being coupled to or separated from the electronic device, wherein the layered accessory case includes a first case configured to cover at least a portion of the electronic device, and a second case configured with a layered structure in the first case. A communication functional unit is capable of delivering a signal with respect to the communication unit, and may be disposed in one or both of the first case and the second case.