An image inspecting apparatus for picking up print images formed on a recording medium with imaging units (8a, 8b), and having a display control device for receiving a selecting operation regarding a plurality of display modes for the images acquired by the imaging units (8a, 8b), and displaying the images in a selected display mode on a display unit, to inspect the print images formed on both a first side and a second side of the recording medium, the apparatus comprising: a first-side fault detecting device for detecting faults on the first side from differences between a first-side reference image created from data for first-side image formation included in print job data for forming the images on the first side of the recording medium, and first-side photo images created from first-side photo data obtained by picking up the images formed on the first side of the recording medium; a first-side fault evaluating device for evaluating the faults on the first side as a slight fault, a middling fault or a serious fault by applying a first-side classification element to classify the faults detected by the first-side fault detecting device; a second-side fault detecting device for detecting faults on the second side from differences between a second-side reference image created from data for second-side image formation included in the print job data for forming the images on the second side of the recording medium, and second-side photo images created from second-side photo data obtained by picking up the images formed on the second side of the recording medium; a second-side fault evaluating device for evaluating the faults on the second side by applying a second-side classification element to classify the faults detected by the second-side fault detecting device; a second-side classification element setting changing device for repeatedly changing in the course of printing from start to finish of the printing, by using the first-side photo image data and comparing the first-side photo images and the second-side faults, a setting of a second-side classification element presented by a second-side classification element setting presenting device; and a storage device for storing printing result information including the setting of the first-side classification element used by the first-side fault evaluating device and the setting of the second-side classification element used by a second-side fault evaluating device, characterized in that the second-side fault evaluating device is configured to evaluate the faults on the second side as a slight fault, a middling fault or a serious fault by applying the second-side classification element to classify the faults detected by second-side fault detecting device; and further characterized by the second-side classification element setting presenting device being configured to present the setting of the second-side classification element to classify the faults on the second side evaluated by the second-side fault evaluating device by displaying on the display unit; and a similar fault registering device for registering, as a similar fault area, an area having occurrence of a similar fault that should be excluded from results of a fault classification by the second-side fault evaluating device, by applying a strike-through detection rule for enabling detection of a strike-through from print-through areas, and by applying an exception rule for excluding print-through areas from classification. a first-side fault detecting device for detecting faults on the first side from differences between a first-side reference image created from data for first-side image formation included in print job data for forming the images on the first side of the recording medium, and first-side photo images created from first-side photo data obtained by picking up the images formed on the first side of the recording medium; a first-side fault evaluating device for evaluating the faults on the first side as a slight fault, a middling fault or a serious fault by applying a first-side classification element to classify the faults detected by the first-side fault detecting device; a second-side fault detecting device for detecting faults on the second side from differences between a second-side reference image created from data for second-side image formation included in the print job data for forming the images on the second side of the recording medium, and second-side photo images created from second-side photo data obtained by picking up the images formed on the second side of the recording medium;