A portable electronic device and a method for manufacturing the same are provided. The portable electronic device includes a front cover that forms a front face of the electronic device, a rear cover that forms a rear face of the electronic device, a bezel that surrounds a space formed by the front cover and the rear cover, a display device that is embedded in the space and includes a screen region that is exposed through the front cover, a metal structure that is positioned within the space, and includes a first face facing the front cover and a second face facing the rear cover, a non-metal structure that is positioned within the space to partially overlap with the metal structure, and includes a first surface facing the front cover and a second surface facing the rear cover, and a metal filler extending from the first surface to the second surface of the non-metal structure through a portion of the non-metal structure. The metal filler is formed of a material that is equal in strength to that of the metal structure, and includes a first end portion adjacent to the first surface and a second end portion adjacent to the second surface, and at least one of the first end portion and the second end portion are aligned to be coplanar with a portion of the first surface and a portion of the second surface, respectively.