A wearable electronic device includes a display component, wearing frames extending from the display component, and an adjusting component slidably coupled with the wearing frames, the adjusting component including a case including first slide holes extending in a first direction, first slide members provided inside the case and coupled with one of the wearing frames through one of the first slide holes, second slide members coupled with the first slide members, respectively, and a driving structure provided in the case, where, with rotation of the driving structure, the second slide members are configured to slide the first slide members in the first direction while moving in a second direction different from the first direction.