An image forming apparatus is provided which can insert a test-printed sheet on an arbitrary page into an intended page. The image forming apparatus includes a test print selection portion, an original document reading portion, a test print page specification portion, a test print portion, a sheet set member, a print instruction portion and a print portion, where from image data on the read original document, overall page information, information specifying the page on which the test print is performed and detection information indicating that the test print page is set in the sheet set member, based on the instruction from the print instruction portion, the print portion performs the print while inserting the test print page into the intended page.