To provide a forming die for hydroforming work and a working method by which occurrence of cracks and thin parts on a material to be worked is prevented even in parts where thickness increasing effect by axial pushing can not be sufficiently attained without restricting the shape of a product and the part to be applied and bringing about the increase of material cost even when the shape of the product is high in flatness rate.
Low friction parts where friction coefficients are relatively lower than other parts of forming surfaces 2a, 3a are provided in the parts where material flow caused by the deformation of a workpiece 4 is suppressed by being brought into contact with the workpiece 4 in a clamping process or the deforming process of the workpiece 4 caused by internal pressure between the forming surfaces 2a, 3a of the forming die 1 consisting of a lower die 2 and an upper die 3.
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