Abstract: To produce an elongate hollow metal body with a cross-sectional contour varying in the longitudinal direction by the internal high-pressure forming process in an internal high-pressure forming press, a sheet-metal blank composed of two blank parts of identical area is first produced, each part having, apart from additional joining-area parts provided in the region of the longitudinal edges, in the longitudinal direction at least the length of the longitudinal hollow body and in the transverse direction at most half the length of the respective cross-sectional contour. Subsequently, the two blank parts are laid one on top of the other and are joined together, in particular welded, in the region of the joining-area parts. Thereafter, the sheet-metal blank is expanded by introducing a pressure medium between the two blank parts held within a tool consisting of two dies.