An electronic device includes a display module and a support plate disposed below the display module and in which an opening pattern is formed that corresponds to a foldable area. The support plate includes a top surface adjacent to the display module and a bottom surface that faces the top surface, and the opening pattern includes an opening that passes through the support plate from the top surface to the bottom surface and a plurality of support parts around the opening. In addition, in a cross-section, the support parts include at least one first support part that includes a first curved edge at one side of the top surface and a second curved edge at one side of the bottom surface that faces the first curved edge in a diagonal direction.