A printer configured for performing printing on a fingernail of a human, the printer comprising: a head configured to perform printing by ejecting ink at positions of ejection of the ink in a print coordinate system; a camera configured to capture an image of an area where the ink is ejected and to output the image in an image coordinate system, the camera capturing an image of a calibration pattern printed by ejecting the ink at a calibration ejection position and outputting the image including the calibration pattern, the calibration ejection position being a position at which the calibration pattern is printed by ejecting the ink; a calculator configured to calculate an amount of displacement between a position of the calibration pattern in the image coordinate system and the calibration ejection position in the print coordinate system; characterized in that the printer further comprises an adjusting jig for adjusting the displacement between the position of the calibration pattern in the image coordinate system and the calibration ejection position in the print coordinate system; wherein a target object is calibration paper on which the calibration pattern is to be printed, the calibration paper being affixed to a surface of the adjusting jig; wherein the printer further comprises a mirror disposed at a position that is within an angle of view capable of being captured by the camera and that faces a plane of intersection with the surface of the adjusting jig on which the calibration pattern is to be printed, and in an orientation in which the plane of intersection is seen in a reflection plane and light from the plane of intersection is reflected off the reflection plane toward the camera; and wherein the calculator is configured to determine whether the calibration paper is present in the plane of intersection seen in the mirror captured by the camera, and when having determined the presence of the calibration paper, to determine that the calibration paper is affixed to the surface of the adjusting jig. a head configured to perform printing by ejecting ink at positions of ejection of the ink in a print coordinate system; a camera configured to capture an image of an area where the ink is ejected and to output the image in an image coordinate system, the camera capturing an image of a calibration pattern printed by ejecting the ink at a calibration ejection position and outputting the image including the calibration pattern, the calibration ejection position being a position at which the calibration pattern is printed by ejecting the ink; a calculator configured to calculate an amount of displacement between a position of the calibration pattern in the image coordinate system and the calibration ejection position in the print coordinate system; characterized in that the printer further comprises an adjusting jig for adjusting the displacement between the position of the calibration pattern in the image coordinate system and the calibration ejection position in the print coordinate system; wherein a target object is calibration paper on which the calibration pattern is to be printed, the calibration paper being affixed to a surface of the adjusting jig; wherein the printer further comprises a mirror disposed at a position that is within an angle of view capable of being captured by the camera and that faces a plane of intersection with the surface of the adjusting jig on which the calibration pattern is to be printed, and in an orientation in which the plane of intersection is seen in a reflection plane and light from the plane of intersection is reflected off the reflection plane toward the camera; and wherein the calculator is configured to determine whether the calibration paper is present in the plane of intersection seen in the mirror captured by the camera, and when having determined the presence of the calibration paper, to determine that the calibration paper is affixed to the surface of the adjusting jig.