A trumpet expandable vertebral device, comprising: a center shaft having a front end and a rear end; a trumpet expandable part holding and surrounding the center shaft, wherein the trumpet expandable part includes: plural expandable plates, each expandable plate having a thickness which increases from the front end toward the rear end; a fixed part, for fixing a relative position of the trumpet expandable part with respect to the center shaft in an axial direction of the center shaft, but allowing the center shaft to rotate with respect to the trumpet expandable part within the fixed part in a radial direction of the center shaft; and a connection part for connecting the trumpet expandable plates with the fixed part; and a trumpet expanding ring mounted outside and surrounding the center shaft, wherein the trumpet expanding ring is located between the center shaft and an internal surface of each expandable plate in the radial direction, and the trumpet expanding ring is in contact with the center shaft and in contact with the internal surface of each expandable plate; wherein when the trumpet expanding ring moves toward the rear end relatively to the trumpet expandable part, the trumpet expandable plates are expanded to restore the height and shape of a vertebra, and wherein the trumpet expanding ring is able to stop at anyone of plural positions relative to the central shaft as the trumpet expanding ring moves toward the rear end relatively to the trumpet expandable part and still steadily fixed at that position to be in contact and in cooperation with the thickness of the expandable plate at that position whereby the trumpet expandable part is able to expand by anyone of plural angle degrees and still steadily fixed at that angle degree. a center shaft having a front end and a rear end; a trumpet expandable part holding and surrounding the center shaft, wherein the trumpet expandable part includes: plural expandable plates, each expandable plate having a thickness which increases from the front end toward the rear end; a fixed part, for fixing a relative position of the trumpet expandable part with respect to the center shaft in an axial direction of the center shaft, but allowing the center shaft to rotate with respect to the trumpet expandable part within the fixed part in a radial direction of the center shaft; and a connection part for connecting the trumpet expandable plates with the fixed part; and a trumpet expanding ring mounted outside and surrounding the center shaft, wherein the trumpet expanding ring is located between the center shaft and an internal surface of each expandable plate in the radial direction, and the trumpet expanding ring is in contact with the center shaft and in contact with the internal surface of each expandable plate; wherein when the trumpet expanding ring moves toward the rear end relatively to the trumpet expandable part, the trumpet expandable plates are expanded to restore the height and shape of a vertebra, and wherein the trumpet expanding ring is able to stop at anyone of plural positions relative to the central shaft as the trumpet expanding ring moves toward the rear end relatively to the trumpet expandable part and still steadily fixed at that position to be in contact and in cooperation with the thickness of the expandable plate at that position whereby the trumpet expandable part is able to expand by anyone of plural angle degrees and still steadily fixed at that angle degree. plural expandable plates, each expandable plate having a thickness which increases from the front end toward the rear end; a fixed part, for fixing a relative position of the trumpet expandable part with respect to the center shaft in an axial direction of the center shaft, but allowing the center shaft to rotate with respect to the trumpet expandable part within the fixed part in a radial direction of the center shaft; and a connection part for connecting the trumpet expandable plates with the fixed part; and a trumpet expanding ring mounted outside and surrounding the center shaft, wherein the trumpet expanding ring is located between the center shaft and an internal surface of each expandable plate in the radial direction, and the trumpet expanding ring is in contact with the center shaft and in contact with the internal surface of each expandable plate; wherein when the trumpet expanding ring moves toward the rear end relatively to the trumpet expandable part, the trumpet expandable plates are expanded to restore the height and shape of a vertebra, and wherein the trumpet expanding ring is able to stop at anyone of plural positions relative to the central shaft as the trumpet expanding ring moves toward the rear end relatively to the trumpet expandable part and still steadily fixed at that position to be in contact and in cooperation with the thickness of the expandable plate at that position whereby the trumpet expandable part is able to expand by anyone of plural angle degrees and still steadily fixed at that angle degree.