According to various embodiments disclosed in the present document, a wearable electronic device comprises: a display part; a pair of wearing frames extending from the display part; and an adjusting part coupled to the wearing frames so as to be slidable, wherein the adjusting part comprises: a case including first slide holes extending in a first direction; first slide members arranged in the case to be slidable, and coupled to one of the wearing frames through one of the first slide holes; second slide members rotatably coupled to the first slide members, respectively; and a driving structure rotatably mounted on the case, wherein the second slide members can be configured to slide the first slide members in the first direction while moving in a second direction that is different from the first direction, according to the rotation of the driving structure. Additional various embodiments are possible.