A double-sided image forming device includes: a paper feeding section (3); a printing section (4); a first conveyance route (6) for conveying a fed paper sheet (2) to a paper discharge section (8) via the printing section (4); and a second conveyance route (7) for receiving, on its conveyance surface, the paper sheet (2), a first side (21) of which has been printed, from the first conveyance route (6), and for conveying the paper sheet (2) while reversing it, thereby conveying the paper sheet (2) to the upstream side of the printing section (4) in the conveyance direction of the first conveyance route (6), wherein the second conveyance route (7) has a reverse conveyance route (9) for receiving, on its conveyance surface, a second side (22) of the paper sheet (2), and for conveying the paper sheet (2) while reversing it, and wherein the reverse conveyance route (9) is formed by a combination of a plurality of reverse mechanisms each including: a first conveyance section (91) for linearly conveying the paper sheet (2); a reverse section (92) for reversing the conveyed paper sheet (2) while bending it along a curved inner peripheral surface; and a second conveyance section (93) for linearly conveying the reversed paper sheet (2).