A shelf support device configured to support a shelf, comprising: a rail extending in forward and backward directions to locate a front end portion over a rear end portion, including an upper surface portion configured to form an upward sloping movement path toward a front side and a lower surface portion configured to form an upward sloping movement path toward the front side below the upper surface portion; and a support unit at which a shelf is mountable at an upper portion of the support unit, coupled to the rail to be movable along the movement path formed by each of the upper surface portion and the lower surface portion, and configured to change a position of the shelf in an upward direction when being moved in the forward direction and to change the position of the shelf in a downward direction when being moved in the backward direction, wherein the support unit includes: a first wheel disposed over the rail and provided to roll along the movement path formed by the upper surface portion; a second wheel disposed below the first wheel by interposing the rail and provided to roll along the movement path formed by the lower surface portion; and moving members (170,180,190) at which the first wheel and the second wheel are installed and configured to be moved in synchronization with movements of the first wheel and the second wheel characterized in that the support unit further includes an elastic support member configured to elastically support at least one of the first wheel and the second wheel to tightly contact the first wheel and the second wheel to the rail, wherein the elastic support member provides an elastic force for pressurizing at least one of the first wheel and the second wheel to narrow a gap between the first wheel and the second wheel, and wherein the elastic support member includes a plate spring having one side in a length direction is coupled to the moving members (170,180,190), provided to be vertically elastically deformable centering on the one side in the length direction coupled to the moving members (170,180,190), and having the other side at which the second wheel is installed. a rail extending in forward and backward directions to locate a front end portion over a rear end portion, including an upper surface portion configured to form an upward sloping movement path toward a front side and a lower surface portion configured to form an upward sloping movement path toward the front side below the upper surface portion; and a support unit at which a shelf is mountable at an upper portion of the support unit, coupled to the rail to be movable along the movement path formed by each of the upper surface portion and the lower surface portion, and configured to change a position of the shelf in an upward direction when being moved in the forward direction and to change the position of the shelf in a downward direction when being moved in the backward direction, wherein the support unit includes: a first wheel disposed over the rail and provided to roll along the movement path formed by the upper surface portion; a second wheel disposed below the first wheel by interposing the rail and provided to roll along the movement path formed by the lower surface portion; and moving members (170,180,190) at which the first wheel and the second wheel are installed and configured to be moved in synchronization with movements of the first wheel and the second wheel characterized in that the support unit further includes an elastic support member configured to elastically support at least one of the first wheel and the second wheel to tightly contact the first wheel and the second wheel to the rail, wherein the elastic support member provides an elastic force for pressurizing at least one of the first wheel and the second wheel to narrow a gap between the first wheel and the second wheel, and wherein the elastic support member includes a plate spring having one side in a length direction is coupled to the moving members (170,180,190), provided to be vertically elastically deformable centering on the one side in the length direction coupled to the moving members (170,180,190), and having the other side at which the second wheel is installed. a first wheel disposed over the rail and provided to roll along the movement path formed by the upper surface portion; a second wheel disposed below the first wheel by interposing the rail and provided to roll along the movement path formed by the lower surface portion; and moving members (170,180,190) at which the first wheel and the second wheel are installed and configured to be moved in synchronization with movements of the first wheel and the second wheel characterized in that the support unit further includes an elastic support member configured to elastically support at least one of the first wheel and the second wheel to tightly contact the first wheel and the second wheel to the rail, wherein the elastic support member provides an elastic force for pressurizing at least one of the first wheel and the second wheel to narrow a gap between the first wheel and the second wheel, and wherein the elastic support member includes a plate spring having one side in a length direction is coupled to the moving members (170,180,190), provided to be vertically elastically deformable centering on the one side in the length direction coupled to the moving members (170,180,190), and having the other side at which the second wheel is installed.