From the beginning of operation of copper instrument firm, Genryoku 4 years (1691) to the Besshi obtained the right to operate in Copper Mt., after 283 years of copper production continues, Sumitomo also continue to grow. After the Meiji Restoration period of chaos Besshi in Copper Mt., the introduction of foreign technology and machinery production capacity has been a substantial leap. Later, while absorbing western technology and expanding copper production, machinery industry, coal industry, wire manufacturing, forestry and other related enterprises have also been developed. Later developed into a modern consortium centered on mining industry and financial industry.