PROBLEM TO BE SOLVED: To provide a composite printer, printing system and image forming device in which a document on a document table can be more appropriately pressed by more simplified operation. SOLUTION: Recording paper P on which an image is formed by an image forming unit, comprises a curl forming means for curling the recording paper P so that its printing surface formed with the image thereon is to be concave. Thus, the recording paper P is placed on document table glass 85, a part of the document is pressed by an auxiliary document presser 83 and if a document table cover 82 is closed later, the recording paper P is prevented from moving. COPYRIGHT: (C)2006,JPO&NCIPI