A document checking apparatus includes an image scanning device, a printing device, an output tray, and a controller. The image scanning device is configured to scan a document image sheet by sheet from a document including plural sheets. The output tray is as an output destination of both the document outputted from the image scanning device and a print sheet outputted from the printing device. The controller is configured to perform checking of the document image, and if an error is detected in the checking of the document image, control the printing device and thereby insert the print sheet as an interleaving sheet immediately before or immediately after a sheet where the error is detected.