To provide a rotary printing machine equipped with an imprinter device and an in-feed device which dispense with a large installation space and facilitate installation of additional equipment.

The rotary printing machine comprises the imprinter device 37 arranged between a paper feeding mechanism and a printing mechanism, and the in-feed device 41 for feeding the supply paper 10 fed from the paper feeding mechanism to the imprinter device 37. The in-feed device 41 and the imprinter device 37 are arranged by stacking them vertically, thus reducing the installation space on a flat surface. For the expansion of the imprinter device 37, moving the in-feed device 41 and the printing device is not necessary, so that it enables additional installation in a narrow place.