Disclosed is an inspection apparatus which avoids a defective item from being mixed with good items, even when a marking device does not work appropriately and a mark for identifying a good item and a defective item cannot be applied. For this purpose, the apparatus is provided with a quality inspection device (6) for determining whether a print portion (3) of a work to be printed (1) whereon a plurality of print portions (3) are printed is a good item (3a) or a defective item (3b), and an inkjet printer (9) as a marking device for printing a mark (13) on the print portion (3) which is identified as a good item (3a) by the quality inspection device (6).