An electronic device may include: a first housing capable of being slid; a second housing; a flexible display including a first region mounted on one surface of the first housing and a second region extending from the first region, wherein the second region is at least partially accommodated inside the first housing or the second housing or exposed to an outside of the first housing or the second housing based on a sliding movement of the first housing; a driving unit disposed in the second housing and configured to provide power for sliding the first housing; and a rail unit including a rail configured to receive the power from the driving unit and to move together with the first housing when the first housing slides.