According to an exemplary embodiment of the present disclosure, an electronic device may comprise a flexible display and a plate. The flexible display may be configured to be at least partially extended out of the inner space of the electronic device. The plate may be arranged on the rear surface of the flexible display. In the plate, a first portion having a first thickness and a second portion having a second thickness that is greater than the first thickness may be repeatedly arranged with respect to one surface of the plate coupled to the rear surface of the flexible display. The plate may comprise a plurality of openings formed in the first portion. The first portion and the second portion may be integrally formed and may comprise the same material.