A portable electronic device is provided. The electronic device includes a transparent front glass cover including a planar portion that forms a front surface of the electronic device, a planar rear glass cover that forms a rear surface of the electronic device, a metal bezel that surrounds a space formed by the front glass cover and the rear glass cover, and a flexible display device that is embedded in the space and exposed through the front glass cover. The front cover includes a left bent portion and a right bent portion on the left and right of the planar portion at the center of the front cover.