To provide a multi-color printer which is capable of printing both sides of a web during the replacement of a printing plate and reducing non- operating time and further, is capable of replacing and dealing with a plurality of printing plates without stopping the printer.

The multi-color printer is constituted of a first plate cylinder 12, a second plate cylinder 22 and a first common inking device 32. In addition, the printer comprises a third plate cylinder 14, a fourth plate cylinder 24, a second common inking device 34 and a common blanket cylinder 100.