A portable communication device comprising: a communication circuit; a foldable housing including a first housing, a second housing, and a hinge disposed between the first housing and the second housing, the first housing including a first side member forming a periphery of the first housing and the second housing including a second side member disposed around the second housing; a flexible display disposed on the foldable housing, wherein at least a part of the flexible display is configured to be folded; a first non-conductive frame coupled to the first side member such that the first non-conductive frame covers a boundary of the flexible display; and a second non-conductive frame facing the first non-conductive frame in the folded state of the foldable housing and coupled to the second side member such that the second non-conductive frame covers a boundary of the flexible display, wherein the first side member includes a first non-conductive portion, a second non-conductive portion, and a first conductive portion disposed between the first non-conductive portion and the second non-conductive portion, operably connected with the communication circuit and coupled to at least a portion of the first non-conductive frame, the second side member includes a third non-conductive portion, a fourth non-conductive portion, and a second conductive portion disposed between the third non-conductive portion and the fourth non-conductive portion and coupled to at least a portion of the second non-conductive frame, characterized in that the first conductive portion and the second conductive portion are spaced apart from each other at least by the first non-conductive frame and the second non-conductive frame in a folded state of the foldable housing. a communication circuit; a foldable housing including a first housing, a second housing, and a hinge disposed between the first housing and the second housing, the first housing including a first side member forming a periphery of the first housing and the second housing including a second side member disposed around the second housing; a flexible display disposed on the foldable housing, wherein at least a part of the flexible display is configured to be folded; a first non-conductive frame coupled to the first side member such that the first non-conductive frame covers a boundary of the flexible display; and a second non-conductive frame facing the first non-conductive frame in the folded state of the foldable housing and coupled to the second side member such that the second non-conductive frame covers a boundary of the flexible display, wherein the first side member includes a first non-conductive portion, a second non-conductive portion, and a first conductive portion disposed between the first non-conductive portion and the second non-conductive portion, operably connected with the communication circuit and coupled to at least a portion of the first non-conductive frame, the second side member includes a third non-conductive portion, a fourth non-conductive portion, and a second conductive portion disposed between the third non-conductive portion and the fourth non-conductive portion and coupled to at least a portion of the second non-conductive frame, characterized in that the first conductive portion and the second conductive portion are spaced apart from each other at least by the first non-conductive frame and the second non-conductive frame in a folded state of the foldable housing.