An electromagnetic actuator having a point of amplified displacement, comprising: a magnetic body comprising: an annular portion including a pair of support iron cores (3a, 3b) and a pair of movable iron cores (4a, 4b) connected to the opposite ends of the support iron cores (3a, 3b), the movable iron cores (4a, 4b) including the point of amplified displacement, and at least one pair of displacement portions (2a, 2b) disposed inside the annular portion and forming a gap therebetween; and a coil, provided in the magnetic body, configured to generate a magnetic flux in the magnetic body by passing an electric current through the coil, wherein the coil is provided in one of the pair of displacement portions (2a, 2b); wherein, in use, the length of the gap between the displacement portions (2a, 2b) is configured to change when the magnetic flux is generated, and a change in the length of the gap is amplified by the support iron cores (3a, 3b) and the movable iron cores (4a, 4b) to produce a large displacement at the point of amplified displacement by using the principle of leverage, wherein the support iron cores (3a, 3b) and the movable iron cores (4a, 4b) as a whole constitute a link mechanism for displacement amplification, the link mechanism comprising a point of effort, a fulcrum and a point of load and wherein a displacement toward the gap is produced in the point of effort and a displacement is produced in the point of load by leverage amplification of the displacement in the point of effort. a magnetic body comprising: an annular portion including a pair of support iron cores (3a, 3b) and a pair of movable iron cores (4a, 4b) connected to the opposite ends of the support iron cores (3a, 3b), the movable iron cores (4a, 4b) including the point of amplified displacement, and at least one pair of displacement portions (2a, 2b) disposed inside the annular portion and forming a gap therebetween; and an annular portion including a pair of support iron cores (3a, 3b) and a pair of movable iron cores (4a, 4b) connected to the opposite ends of the support iron cores (3a, 3b), the movable iron cores (4a, 4b) including the point of amplified displacement, and at least one pair of displacement portions (2a, 2b) disposed inside the annular portion and forming a gap therebetween; and a coil, provided in the magnetic body, configured to generate a magnetic flux in the magnetic body by passing an electric current through the coil, wherein the coil is provided in one of the pair of displacement portions (2a, 2b); wherein, in use, the length of the gap between the displacement portions (2a, 2b) is configured to change when the magnetic flux is generated, and a change in the length of the gap is amplified by the support iron cores (3a, 3b) and the movable iron cores (4a, 4b) to produce a large displacement at the point of amplified displacement by using the principle of leverage, wherein the support iron cores (3a, 3b) and the movable iron cores (4a, 4b) as a whole constitute a link mechanism for displacement amplification, the link mechanism comprising a point of effort, a fulcrum and a point of load and wherein a displacement toward the gap is produced in the point of effort and a displacement is produced in the point of load by leverage amplification of the displacement in the point of effort.