An electronic device according to an embodiment includes a first housing, a second housing coupled to the first housing so as to be slidable with respect to the first housing, a display including a planar region and a deformable region in contact with the planar region, and a support plate configured to supporting the display. The support plate includes rigid regions and a flexible region disposed between the rigid regions and including a plurality of openings. The support plate further includes a first layer including a plurality of first openings in the flexible region, and a second layer disposed on the first layer and including a plurality of second openings partially overlapping each of the plurality of first openings in the flexible region. Other embodiments are also possible.