An image forming apparatus comprising: a sheet conveyance device that includes a feeding roller configured to feed a continuous-form sheet, a winding roller configured to wind the continuous-form sheet fed from the feeding roller, a conveyance roller pair disposed between the feeding roller and the winding roller and configured to nip and convey the continuous-form sheet, and a tension applying device configured to apply tension to the continuous-form sheet between the feeding roller and the winding roller; and an image forming device configured to form an image on the continuous-form sheet at a position between the tension applying device and the winding roller in a conveyance path of the continuous-form sheet, wherein the tension applying device comprises: a guide rail inclined downward toward a continuous-form sheet; a slider configured to slide along the guide rail; a tension bar supported by the slider and brought into pressure contact with the continuous-form sheet by weight of the slider; and an angle adjustment mechanism (21, 22, 28, 29a, 29b) configured to adjust an inclination angle of the guide rail with respect to a horizontal direction, wherein the angle adjustment mechanism (21, 22, 28, 29a, 29b) includes: a bracket configured to support the guide rail, and a rotation shaft fixed to the bracket and configured to be rotatably supported by a frame of the sheet conveyance device, wherein the rotation shaft is coaxial with the tension bar when the slider is positioned at a lower end of the guide rail. a sheet conveyance device that includes a feeding roller configured to feed a continuous-form sheet, a winding roller configured to wind the continuous-form sheet fed from the feeding roller, a conveyance roller pair disposed between the feeding roller and the winding roller and configured to nip and convey the continuous-form sheet, and a tension applying device configured to apply tension to the continuous-form sheet between the feeding roller and the winding roller; and a feeding roller configured to feed a continuous-form sheet, a winding roller configured to wind the continuous-form sheet fed from the feeding roller, a conveyance roller pair disposed between the feeding roller and the winding roller and configured to nip and convey the continuous-form sheet, and a tension applying device configured to apply tension to the continuous-form sheet between the feeding roller and the winding roller; and an image forming device configured to form an image on the continuous-form sheet at a position between the tension applying device and the winding roller in a conveyance path of the continuous-form sheet, wherein the tension applying device comprises: a guide rail inclined downward toward a continuous-form sheet; a slider configured to slide along the guide rail; a tension bar supported by the slider and brought into pressure contact with the continuous-form sheet by weight of the slider; and an angle adjustment mechanism (21, 22, 28, 29a, 29b) configured to adjust an inclination angle of the guide rail with respect to a horizontal direction, wherein the angle adjustment mechanism (21, 22, 28, 29a, 29b) includes: a bracket configured to support the guide rail, and a rotation shaft fixed to the bracket and configured to be rotatably supported by a frame of the sheet conveyance device, wherein the rotation shaft is coaxial with the tension bar when the slider is positioned at a lower end of the guide rail. a guide rail inclined downward toward a continuous-form sheet; a slider configured to slide along the guide rail; a tension bar supported by the slider and brought into pressure contact with the continuous-form sheet by weight of the slider; and an angle adjustment mechanism (21, 22, 28, 29a, 29b) configured to adjust an inclination angle of the guide rail with respect to a horizontal direction, wherein the angle adjustment mechanism (21, 22, 28, 29a, 29b) includes: a bracket configured to support the guide rail, and a rotation shaft fixed to the bracket and configured to be rotatably supported by a frame of the sheet conveyance device, a bracket configured to support the guide rail, and a rotation shaft fixed to the bracket and configured to be rotatably supported by a frame of the sheet conveyance device, wherein the rotation shaft is coaxial with the tension bar when the slider is positioned at a lower end of the guide rail.