An image reading apparatus includes: a hardware processor that acquires scan data obtained by reading from printed matter outputted by an image forming apparatus; an acquisitor that acquires print data used for image formation of the printed matter from the image forming apparatus; a first determiner that compares the scan data and the print data and detects whether or not the scan data and the print data match; a second determiner that determines whether or not a predetermined reference image is included in the scan data when a determination result by the first determiner is negative; and a first discarder that causes the scan data to be discarded when a determination result by the second determiner is positive.