An electronic device having a housing formed of a conductive material, and an antenna device thereof. The electronic device includes a housing provided with a plurality of housing modules, and a printed circuit board positioned inside the housing, and having an antenna power feeding unit electrically connected to the printed circuited board. The plurality of housing modules may be at least partially formed of a conductive material. At least one of the conductive materials of the plurality of housing modules may be electrically connected to the antenna power feeding unit of the printed circuit board so as to function as an antenna of the electronic device. Various embodiments may be made based on the technical idea of the present disclosure.