A display device includes a display panel including a first display area and a second display area extended from the first display area, a support member that supports the first display area, a bottom cover coupled to the support member, an inner case configured to bend a part of the second display area and to be movable along an extension direction of the display panel, and a sub-plate disposed between the inner case and the second display area so as to be extended from an end portion of the support member. In a first mode, the first display area and the second display area overlap each other with the inner case interposed therebetween. In a second mode, an end portion of the second display area overlaps another portion of the second display area. Therefore, a step between a first display area and a second display area can be reduced.