A device (100, 100') for adjusting the curvature of a mirror by applying bending moments to both ends of the mirror or releasing the bending moments, the device comprising: a base block (110, 110'); a pair of rotating blocks (120a, 120b, 120'a, 120'b) which are each connected to the base block (110,110') through at least one first elastic body, each of the pair of rotating blocks (120a, 120b, 120'a, 120'b) being rotated around a respective rotating point being a connection portion between the base block (110, 110'); and the first elastic body and elastically returning to its original position through the application or release of an external force; a pair of support blocks which are respectively disposed on the pair of rotating blocks (120a, 120b, 120'a, 120'b) to support both ends of the mirror, the pair of support blocks applying bending moments to both ends of the mirror by the rotation of the pair of rotating blocks (120a, 120b, 120'a, 120'b); and a driving part (140, 140') rotating the pair of rotating blocks (120a, 120b, 120'a, 120'b), wherein the first elastic body connects the rotating blocks (120a, 120b, 120'a, 120'b) to the base block (110,110') so that the support points of the support blocks of the mirror move upward with respect to the mirror, when the rotating blocks (120a, 120b, 120'a, 120'b) are rotated while the central point of the mirror is moved downward with respect to the support points by a change in the curvature as the rotating blocks (120a, 120b, 120'a, 120'b) are rotated such that the position of the central point is fixed with respect to the base block (110, 110'); wherein the first elastic body has a shape of cantilever whose upper portion is connected to the base block (110,110') at the rotating point and whose lower portion is connected to the rotating blocks (120a, 120b, 120'a, 120'b) and when viewed from a front side, the rotating point is disposed at a position adjacent to the reflection surface of the mirror. a base block (110, 110'); a pair of rotating blocks (120a, 120b, 120'a, 120'b) which are each connected to the base block (110,110') through at least one first elastic body, each of the pair of rotating blocks (120a, 120b, 120'a, 120'b) being rotated around a respective rotating point being a connection portion between the base block (110, 110'); and the first elastic body and elastically returning to its original position through the application or release of an external force; a pair of support blocks which are respectively disposed on the pair of rotating blocks (120a, 120b, 120'a, 120'b) to support both ends of the mirror, the pair of support blocks applying bending moments to both ends of the mirror by the rotation of the pair of rotating blocks (120a, 120b, 120'a, 120'b); and a driving part (140, 140') rotating the pair of rotating blocks (120a, 120b, 120'a, 120'b), wherein the first elastic body connects the rotating blocks (120a, 120b, 120'a, 120'b) to the base block (110,110') so that the support points of the support blocks of the mirror move upward with respect to the mirror, when the rotating blocks (120a, 120b, 120'a, 120'b) are rotated while the central point of the mirror is moved downward with respect to the support points by a change in the curvature as the rotating blocks (120a, 120b, 120'a, 120'b) are rotated such that the position of the central point is fixed with respect to the base block (110, 110'); wherein the first elastic body has a shape of cantilever whose upper portion is connected to the base block (110,110') at the rotating point and whose lower portion is connected to the rotating blocks (120a, 120b, 120'a, 120'b) and when viewed from a front side, the rotating point is disposed at a position adjacent to the reflection surface of the mirror.