According to various embodiments, an electronic device may include a housing including at least one opening and made of a metal material, a key button assembly disposed in an inner space of the housing and disposed to be at least partially exposed to an outside through the at least one opening, a support frame disposed beneath the key button assembly in the inner space, an antenna structure fixed beneath the support frame and positioned to at least partially correspond to the at least one opening, the antenna structure including a substrate and at least one antenna element disposed on the substrate, and a wireless communication circuit disposed in the inner space and configured to form a directional beam in a designated frequency band toward the key button assembly through the at least one antenna element.