To enable an operator to easily perform work in a storage section in the event of paper jamming or the like, in a double side printing device.

The double side printing device includes the first printing section which performs printing on one side of a paper sheet, a storage section which stores a plurality of one side printed paper sheets, and a second printing section which performs printing on the other side of the paper sheet conveyed from the storage section. The storage section has, with a prescribed space apart, a carrying-in position where the one side printed paper sheet is carried in and a carrying-out position where the stored paper sheet is carried out, a holding/moving device 6 which successively holds the lower end of each of paper sheets carried in the carrying-in position and moves it from the carrying-in position to the carrying-out position in a state of being stacked on one another with the prescribed space in-between, and a curl imparting tool 52 which protrudes the carried-in paper sheet forward from the carrying-in position side to the carrying-out position side, at a position opposing to the left and right lower ends of the carried-in paper sheet and which imparts a curl bending with the printed side inside for the carried-in paper, wherein the curl imparting tool 52 is configured to be able to retreat to the carrying-in position side.