An electronic device is provided, including a foldable housing including first and second housing structures; a hinge structure disposed between the first housing structure and the second housing structure and configured to fold or unfold the first housing structure and the second housing structure; a flexible display exposed through at least a portion of a first surface of the foldable housing; a battery disposed inside the second housing structure wherein a partial surface thereof is adjacent to the hinge structure; and a battery plate disposed between the battery and the flexible display, wherein the battery plate includes: a first surface parallel to the first surface of the foldable housing; a first fastening part aligned with the first surface of the battery plate and coupled to a first surface of the second housing structure; a second surface perpendicular to the first surface of the battery plate and adjacent to the hinge structure; and a second fastening part perpendicular to the second surface of the battery plate and coupled to a second surface of the second housing structure opposite to the first surface of the second housing structure.