In an embodiment, an electronic device may include a housing including a first housing structure and a second housing structure that are rotatably connected to each other by a hinge structure; a flexible display including a first area, a second area, and a third area; and a first plate disposed between the housing and the flexible display. The first plate may include a first planar portion facing the first area, a second planar portion facing the second area, and a bendable portion. The first plate may further include at least one opening structure formed at a designated position on the outer sides S of at least one of the first planar portion and the second planar portion to be at least partially stretchable or compressible.