PURPOSE: To suppress oxidation of a metal at the time of hot press-sticking, and to elevate a manufacturing yield, by welding 2 sheets of metals one of which is "Invar ", by an electronic beam, and subsequently, executing hot rolling by heating at a specified temperature.

CONSTITUTION: As a base material, to a low expansion side metal, an invar, that is to say, the first metal 1 consisting of an iron alloy containing 35W37% nickel is clad, and to a high expansion side metal, the second metal 2 whose coefficient of thermal expansion is larger than Invar is clad. The junction boundary part of both sides in the longitudinal direction of both the clad metals 1, 2 is welded by performing electronic beam welding. Subsequently, the welded metals 1, 2 are heated at a temperature of 900W1,000°C, are made to pass through between rolling rollers, and hot rolling is executed. By this hot rolling, the metals 1, 2 are rolled together since the junction boundary part is welded in advance, and at the same time, as for the metals 1, 2, each junction surface is press-stuck to each other. Subsequently, the oxide film is removed by sandblast, and they are finished to prescribed dimensions by cold rolling.