PURPOSE: To work a bus bar in a short time and with accuracy and to improve the workability by rotating a pair of swing levers with a drive device, rotating and moving a sliding plate supported by this lever and longitudinally bending a bus bar inserted between both side plates along a guide roll.

CONSTITUTION: Two side plates 3 are arranged in parallel through a gap nealy equal to the thickness of a bus bar A and a fixed shaft 11 is driven through both side plates and fixed. Then, the guide roll 12 to decide a bend radius of longitudinal bending of the bus bar A is set to the fixed shaft 11 of both side plates 3 and a pair of swing levers 13, wherein the respective one end part is supported freely rotatably on the fixed shaft 11, are arranged on the outside of both side plates 3. A drive shaft 22 of a hydraulic cylinder 17 to reciprocatively rotate the swing levers is connected with the other end parts of both these levers, the facing surface to the guide roll 12 is formed flatly in the middle part of both levers 13 and a sliding plate 15 giving a longitudinal bending force as it slides the outside edge is supported on the bus bar A.