To prevent an embossing part on the surface of a metal from being crushed by arranging plural pressing dies in steps like series in row so that the projecting degree is increased orderly from an end of the series toward another end with a spring, and arranging spacers on the end of the die.

This die is composed of a receiving die 11 having plural projections and a pressing die 12 having one projection. Then, plural the pressing dies are arranged in stairs so that the degree of projecting of the die part is increased orderly from one direction of the series toward another. In the pressing die 12, spacers 13 are formed on the both ends. In the spacer 13, the both end parts are enough formed by one body so as to be projected than the central part, or plate like members 15 are formed enough by being arranged on the both end parts of the pressing die, Further, another composing members 16 are also enough arranged on the both ends of the pressing die. Therefore, the pressure difference of the spring of the die is made without requiring from finely regulating.