An electronic device including a flexible display is provided. The electronic device includes a first housing, a second housing slidably coupled to a side surface of the first housing, a flexible display including a first area on the first housing and a second area extending from the first area, a gear structure arranged in the first housing, and an installation member rotatably coupled to the first housing and separated from or mounted on at least a part of a human body, wherein the flexible display can be rotated and rolled according to the rotation of the gear structure while the first area is exposed to the outside, such that at least a part of the second area may be exposed to the outside.