A sheet conveyance device comprising: a first conveyance unit which includes a first holder that holds one edge of a sheet (S1, S1a, S1b), and conveys the sheet held by said first holder; a second conveyance unit which includes a second holder (33a - 33c) that holds the one edge of the sheet, and conveys the sheet held by said second holder; a third conveyance unit, said third conveyance unit including a third holder that holds the other edge of the sheet conveyed by said first conveyance unit, and conveying the sheet held by said third holder; an independent driving unit which independently drives said first conveyance unit; a device driving unit which drives an entire device including said second conveyance unit and said third conveyance unit; and a control unit which controls said independent driving unit to adjust a speed at which said third conveyance unit conveys the sheet, based on a dimension of the sheet in a conveyance direction, said first conveyance unit includes a rotatably supported transport cylinder, and said independent driving unit includes an independent driving motor which drives said transport cylinder independently of a device driving system, characterized in that the third conveyance unit is supported to be swingable between a reception position at which said third conveyance unit receives the sheet from said first conveyance unit, and a transfer position at which said third conveyance unit transfers the sheet to said second conveyance unit, and by further comprising a fourth conveyance unit which is arranged on an upstream side of said transport cylinder in a sheet conveyance direction, includes a fourth holder that holds one edge of the sheet, and transfers the sheet held by said fourth holder to said first holder of said transport cylinder, wherein said control unit controls said independent driving motor to adjust a rotation speed of said transport cylinder in accordance with the dimension of the sheet in the conveyance direction so that the other edge of the sheet conveyed by said transport cylinder is opposed to said third holder when said third conveyance unit is set at the sheet reception position, and said fourth holder of said fourth conveyance unit is opposed to said first holder of said first conveyance unit after the sheet is transferred to said third holder. a first conveyance unit which includes a first holder that holds one edge of a sheet (S1, S1a, S1b), and conveys the sheet held by said first holder; a second conveyance unit which includes a second holder (33a - 33c) that holds the one edge of the sheet, and conveys the sheet held by said second holder; a third conveyance unit, said third conveyance unit including a third holder that holds the other edge of the sheet conveyed by said first conveyance unit, and conveying the sheet held by said third holder; an independent driving unit which independently drives said first conveyance unit; a device driving unit which drives an entire device including said second conveyance unit and said third conveyance unit; and a control unit which controls said independent driving unit to adjust a speed at which said third conveyance unit conveys the sheet, based on a dimension of the sheet in a conveyance direction, said first conveyance unit includes a rotatably supported transport cylinder, and said independent driving unit includes an independent driving motor which drives said transport cylinder independently of a device driving system, characterized in that the third conveyance unit is supported to be swingable between a reception position at which said third conveyance unit receives the sheet from said first conveyance unit, and a transfer position at which said third conveyance unit transfers the sheet to said second conveyance unit, and by further comprising a fourth conveyance unit which is arranged on an upstream side of said transport cylinder in a sheet conveyance direction, includes a fourth holder that holds one edge of the sheet, and transfers the sheet held by said fourth holder to said first holder of said transport cylinder, wherein said control unit controls said independent driving motor to adjust a rotation speed of said transport cylinder in accordance with the dimension of the sheet in the conveyance direction so that the other edge of the sheet conveyed by said transport cylinder is opposed to said third holder when said third conveyance unit is set at the sheet reception position, and said fourth holder of said fourth conveyance unit is opposed to said first holder of said first conveyance unit after the sheet is transferred to said third holder.