A sheet processing apparatus comprising: a conveyance unit that conveys a sheet along a first direction; a processing unit that performs processing on the sheet conveyed by the conveyance unit; and a controller that controls the conveyance unit and the processing unit, wherein the processing unit includes: a cutting unit capable of cutting the sheet along a cutting line extending in a second direction intersecting with the first direction; a holding unit that is configured to be movable between a holding position at which the sheet is held by being sandwiched in a thickness direction of the sheet and a release position at which holding of the sheet is released, and that is disposed such that a holding line, which is formed on the sheet when the sheet is held, is substantially parallel to the cutting line; and an angle adjuster capable of adjusting an angle of the cutting unit and the holding unit with respect to the first direction, wherein the holding unit includes a pair of holding members each extending in the second direction and disposed in the thickness direction of the sheet, the pair of holding members include a movable holding member configured to be capable of moving in the thickness direction of the sheet to adjust a distance between the pair of holding members, characterized in that at least one of the pair of holding members is configured by a roller (221, 222) including a central axis extending along the second direction, the roller (221, 222) being rotatable about the central axis, the processing unit further includes a drive device that rotates the roller (221, 222), and the controller controls the drive device to rotate the roller (221, 222) while the sheet is being conveyed by the conveyance unit. a conveyance unit that conveys a sheet along a first direction; a processing unit that performs processing on the sheet conveyed by the conveyance unit; and a controller that controls the conveyance unit and the processing unit, wherein the processing unit includes: a cutting unit capable of cutting the sheet along a cutting line extending in a second direction intersecting with the first direction; a holding unit that is configured to be movable between a holding position at which the sheet is held by being sandwiched in a thickness direction of the sheet and a release position at which holding of the sheet is released, and that is disposed such that a holding line, which is formed on the sheet when the sheet is held, is substantially parallel to the cutting line; and an angle adjuster capable of adjusting an angle of the cutting unit and the holding unit with respect to the first direction, wherein the holding unit includes a pair of holding members each extending in the second direction and disposed in the thickness direction of the sheet, the pair of holding members include a movable holding member configured to be capable of moving in the thickness direction of the sheet to adjust a distance between the pair of holding members, characterized in that at least one of the pair of holding members is configured by a roller (221, 222) including a central axis extending along the second direction, the roller (221, 222) being rotatable about the central axis, the processing unit further includes a drive device that rotates the roller (221, 222), and the controller controls the drive device to rotate the roller (221, 222) while the sheet is being conveyed by the conveyance unit. a cutting unit capable of cutting the sheet along a cutting line extending in a second direction intersecting with the first direction; a holding unit that is configured to be movable between a holding position at which the sheet is held by being sandwiched in a thickness direction of the sheet and a release position at which holding of the sheet is released, and that is disposed such that a holding line, which is formed on the sheet when the sheet is held, is substantially parallel to the cutting line; and an angle adjuster capable of adjusting an angle of the cutting unit and the holding unit with respect to the first direction, wherein the holding unit includes a pair of holding members each extending in the second direction and disposed in the thickness direction of the sheet, the pair of holding members include a movable holding member configured to be capable of moving in the thickness direction of the sheet to adjust a distance between the pair of holding members, characterized in that at least one of the pair of holding members is configured by a roller (221, 222) including a central axis extending along the second direction, the roller (221, 222) being rotatable about the central axis, the processing unit further includes a drive device that rotates the roller (221, 222), and the controller controls the drive device to rotate the roller (221, 222) while the sheet is being conveyed by the conveyance unit.