A bending device (2, 150, 170) which bends a longitudinal workpiece, comprising: a track device (4, 152, 172) which linearly extends in a predetermined direction, wherein the track device (4, 152, 172) includes a first track device and a second track device which is provided separately from the first track device and disposed parallel to the first track device; a first base (6, 158, 178) which is placed on the first track device and is movable on the first track device; a second base (8, 164, 184) which is placed on the second track device and is movable on the second track device; a first robot (10, 160, 180) which is mounted on the first base (6, 158, 178); a second robot (12, 166, 186) which is mounted on the second base (8, 164, 184); and a bending mechanism (50, 50a, 50b) which is disposed at each end of the first and second robots (10, 12, 160, 166, 180, 186), and grips and bends the workpiece, wherein the first robot (10, 160, 180) is a multi-articulated robot including at least a joint which is rotatable around an axis vertical to the first base (6, 158, 178) on which the first robot (10, 160, 180) is mounted, and a joint which is rotatable around an axis parallel to an axial direction of the workpiece, and the second robot (12, 166, 186) is a multi-articulated robot including at least a joint which is rotatable around an axis vertical to the second base (8, 164, 184) on which the second robot (12, 166, 186) is mounted, and a joint which is rotatable around an axis parallel to the axial direction of the workpiece, characterized in that the first track device and the second track device are arranged on the same straight line. a track device (4, 152, 172) which linearly extends in a predetermined direction, wherein the track device (4, 152, 172) includes a first track device and a second track device which is provided separately from the first track device and disposed parallel to the first track device; a first base (6, 158, 178) which is placed on the first track device and is movable on the first track device; a second base (8, 164, 184) which is placed on the second track device and is movable on the second track device; a first robot (10, 160, 180) which is mounted on the first base (6, 158, 178); a second robot (12, 166, 186) which is mounted on the second base (8, 164, 184); and a bending mechanism (50, 50a, 50b) which is disposed at each end of the first and second robots (10, 12, 160, 166, 180, 186), and grips and bends the workpiece, wherein the first robot (10, 160, 180) is a multi-articulated robot including at least a joint which is rotatable around an axis vertical to the first base (6, 158, 178) on which the first robot (10, 160, 180) is mounted, and a joint which is rotatable around an axis parallel to an axial direction of the workpiece, and the second robot (12, 166, 186) is a multi-articulated robot including at least a joint which is rotatable around an axis vertical to the second base (8, 164, 184) on which the second robot (12, 166, 186) is mounted, and a joint which is rotatable around an axis parallel to the axial direction of the workpiece, characterized in that the first track device and the second track device are arranged on the same straight line.