An electronic device is provided. The electronic device includes a first housing structure including a conductive first side member, a second housing structure including a conductive second side member, a hinge structure rotatably connecting the first housing structure and the second housing structure, and a printed circuit board. The first side member or the second side member may include a first side face, a second side face, a third side face, a fourth side face, a first slit formed in the fourth side face, and a second slit formed in any one of the first side face, the second side face, and the third side face. At least a part of the second side face or the third side face between the first slit and the second slit may be made of a conductive material and electrically connected to the printed circuit board as a radiating conductor.