Calibration tool for scanning endoscope

A calibration tool for a scanning endoscope, provided for calibrating an image acquired by a scanning endoscope that scans illuminating light and detects return light to create an image, the calibration tool comprising:

• an abutment portion that is in contact with and abuts an illumination window provided in a distal end face of an insertion portion of the scanning endoscope and is configured to be in contact with a region of the illumination window other than a region in which an illuminating light beam applied from the illumination window is scanned;
• and
• a chart with a calibration pattern drawn thereon, the calibration pattern being provided for calibrating a scan pattern of the illuminating light, the chart being arranged parallel to the distal end face with a predetermined distance from a surface of the illumination window positioned as a result of the illumination window coming into contact with the abutment portion, according to a size of the calibration pattern.