One or more embodiments disclosed herein relate to an electronic device antenna structure, and may provide an electronic device that includes a pen housing including a first end part, a second end part, and inner space; a printed circuit board (PCB) located in the inner space; and an antenna structure. The antenna structure may include a first conductive part located between the pen housing and the first surface of the PCB; a second conductive part electrically connected to the first conductive; and a third conductive part electrically connected to the first conductive part. At least one part of the PCB may be arranged between the second conductive part and the third conductive part when the first surface of the PCB is viewed from an upper surface thereof. Additional other embodiments can be provided.