Abstract: A label affixing system with which a signal can be supplied to a label affixing machine from an image capturing unit which detects a conveyed object to be labeled. The label affixing system includes a plurality of conveyance lines, a CCD for capturing an image of the conveyed object, and a label affixing machine that includes a plurality of printing formats and affixes a printed label to the conveyed object. The system measures a distance to the conveyed object subjected to image capture by the CCD; selects one printing format from the plurality of printing formats on the basis of the measured distance to the conveyed object; prints the label on the basis of the selected printing format; and affixes the printed label to the conveyed object.