To provide each of sheets of various sheet sizes with an appropriate curl, in an accumulation section of a double-sided printer.

The double-sided printer includes: a first printing section printing on one surface of the sheet; the accumulation section into which the sheet printed on the one surface is carried, and which accumulates the plurality of sheets carried in; a second printing section printing on the other surface of the sheet carried out of the accumulation section. The accumulation section includes: a curl providing means 52 providing each of the sheets, serially carried into a carry-in position in the accumulation section, with a curl curving with the printed one surface inward, and having a first curl providing member 525a providing the sheet larger than or equal to a prescribed size with the curl, and a second curl providing member 525b providing the sheet smaller than the prescribed size with the curl; and a holding and transfer means 53 serially holding the lower end portion of each sheet serially carried into a carry-in position and provided with the curl, transferring the sheets to a carry-out position in the accumulation section in a state where lower end portions have a prescribed interval with each other, and serially releasing the holding of the lower end portion.