An electronic device having a flexible display is provided. The electronic device includes a first housing, a second housing slidably coupled to a side of the first housing, a flexible display including a first area mounted on the first housing and a second area extending from the first area, a gear structure disposed within the first housing, and a mounting member rotatably coupled to the first housing and mounted on or separated from at least a portion of the human body, wherein the flexible display may be rotated and rolled according to rotation of the gear structure in a state in which the first area is exposed to the outside, thereby exposing at least a portion of the second area to the outside.