A flexible device in which a display is folded is provided. The flexible device includes a main body, a flexible display fixed to a first surface of the main body, and a cover coupled to the main body to face a second surface of the main body, wherein the second surface of the main body is opposite to the first surface of the main body, such that when the main body is curved or folded, the cover moves with respect to the second surface of the main body to compensate for a difference in elongation, which is generated when the main body is curved or folded.