1. An image defect detection device, comprising: image acquisition means for acquiring an original print image and a print image printed on the basis of the original print image; region division means for dividing the original print image and the print image into corresponding regions; image feature amount acquisition means for acquiring an image feature amount of each divided region; differential strength extraction means for extracting a strength of a difference of each divided region between the original print image and the print image; expected image defect value calculation means for calculating an expected image defect value indicating a possibility of presence of a defect in each divided region of the print image from the image feature amount and the strength of the difference of each divided region; image defect detection order determination means for determining an order of detection of the image defect of the divided region of the print image from the expected image defect value; and image defect detection means for detecting an image defect of the print image in the determined order.