An electronic device is provided. The electronic device includes a body including a plurality of segment members connected to each other to be rotatable, the body being configured to switch to a flat state or a bent state by rotations of the plurality of segment members, a flexible display device supported by the body, a return spring configured to maintain the body in the bent state with an elastic force so that the body returns to the flat state, and a locking unit configured to lock the body at various bent states with different curvatures.