To attain size reduction in a device and prevent a printed image from being rubbed and smeared by re-transfer while improving stable conveyance of printing paper.

This printer conducts printing on both faces of printing paper 31 by means of a plate cylinder 11 wound with a master 13 around the outer surface 11a and a printing part 57 formed between the plate cylinder and a printing pressure member 21 opposing the plate cylinder. An intermediate paper delivery base 71 accommodating the printing paper 31 whose one side is printed in two-sided printing, is disposed near the printing pressure member 21 and displaced from a standby position where the one-side printed paper 31 is received to a re-feeding position where a received printing paper 34 is re-fed to the printing part by means of a displacement means 70. The lead-in path 2 coupling the printing part and the intermediate paper delivery base at the standby position and a re-feeding path 3 coupling the intermediate paper delivery base at the re-feeding position with the printing part are formed along the printing pressure member, respectively.