A wearable electronic device includes a front with a lens connected thereto, and includes a first metal portion. A first leg is connected to one end of the front through a first hinge, and includes a second metal portion. A second leg is connected to the other end of the front through a second hinge. A printed circuit board (PCB) includes a ground portion electrically connected to the first metal portion and/or the second metal portion. An antenna structure includes a radiating element and a feeder electrically connected to the radiating element. The antenna structure is electrically connected to the ground portion. A first switch circuit is configured to electrically connect or disconnect the first metal portion and the second metal portion and is also configured to change an impedance for connecting the first metal portion and the second metal portion. A controller controls the first switch circuit.