PURPOSE: To improve the workability of laminating treatment, and to save space by providing a section near a carrying-in port receiving transfer paper with a changeover means changing over laminating/non-laminating.

CONSTITUTION: A laminator C is mounted detachably to a picture forming device body by a latch mechanism section 15. 16 represents a flapper, and distributes laminating or non-laminating in response to a changeover switch in an operating section 17 installed to the sheathing section of the laminator C. When the indication of non-laminating is input from the operating section 17, the flapper 16 is brought to the state of a broken line, transfer paper 10 is deflected to a non-laminating path 18, and transfer paper 10 is put on a paper discharge tray 20 by a paper discharge roller 19. When the indication of laminating is input from the operating section 17, the flapper 16 is brought to the state of a solid line, transfer paper 10 is deflected to a laminating path 21, and transfer paper 10 is transferred to a laminating treating section.