A connection component, a foldable display, and a foldable electronic device are provided. The foldable display includes a display, middle frames, a hinge, and a fastener. The display is disposed above the middle frames and the hinge, the middle frames and the hinge are fastened by using the fastener, and the middle frames include a first mechanical part and the hinge includes a second mechanical part, or the middle frames include the second mechanical part and the hinge includes the first mechanical part. The first mechanical part is provided with a protruding portion, a bearing portion, and a threaded hole, and the threaded hole is at least partially provided on the protruding portion.