A measurement support device comprising: a head configured to emit measurement auxiliary light; an imaging unit configured to capture an image of a subject on which a spot is formed with the measurement auxiliary light via an imaging optical system and an imaging element, wherein the head is configured to emit the measurement auxiliary light at an an inclination angle with respect to an optical axis of the imaging optical system so as to cross an angle of view of the imaging optical system; a measurement unit configured to measure coordinates of a representation of the spot in the image; a storage unit configured to: store the coordinates of the representation of the spot in association with coordinates of points indicating an actual size of a measurement target in the subject and indicating a distorted circular marker, the distortion in accordance with the distortion aberration of the imaging optical system, and store the coordinates of the points indicating the distorted circular marker with respect to a plurality of points in a trajectory along which the representation of the spot moves on the image in a case where an imaging distance of the image is changed; a coordinate acquisition unit configured to refer to the storage unit on the basis of the measured coordinates of the representation of the spot and a display control unit, characterized in that the coordinate acquisition unit is configured to acquire the coordinates of the points indicating the distorted circular marker corresponding to the coordinates of the representation of the spot; and in that the display control unit is configured to cause the distorted circular marker to be displayed in the vicinity of the representation of the spot in the image on the basis of the acquired coordinates, the distortion in accordance with the distortion aberration of the imaging optical system. a head configured to emit measurement auxiliary light; an imaging unit configured to capture an image of a subject on which a spot is formed with the measurement auxiliary light via an imaging optical system and an imaging element, wherein the head is configured to emit the measurement auxiliary light at an an inclination angle with respect to an optical axis of the imaging optical system so as to cross an angle of view of the imaging optical system; a measurement unit configured to measure coordinates of a representation of the spot in the image; a storage unit configured to: store the coordinates of the representation of the spot in association with coordinates of points indicating an actual size of a measurement target in the subject and indicating a distorted circular marker, the distortion in accordance with the distortion aberration of the imaging optical system, and store the coordinates of the points indicating the distorted circular marker with respect to a plurality of points in a trajectory along which the representation of the spot moves on the image in a case where an imaging distance of the image is changed; a coordinate acquisition unit configured to refer to the storage unit on the basis of the measured coordinates of the representation of the spot and a display control unit, characterized in that the coordinate acquisition unit is configured to acquire the coordinates of the points indicating the distorted circular marker corresponding to the coordinates of the representation of the spot; and in that the display control unit is configured to cause the distorted circular marker to be displayed in the vicinity of the representation of the spot in the image on the basis of the acquired coordinates, the distortion in accordance with the distortion aberration of the imaging optical system.