PURPOSE: To eliminate various troubles such as an electrode crack, deposit, etc., in the course of spot welding of an aluminum alloy, and to enable welding with high performance in the spot welding, etc., of an aluminum alloy sheet.

CONSTITUTION: The manufacture of an electrode for spot welding is performed in which a green compact made by mixing Cu powder and Sn powder and a green compact made of Cu powder or Cu alloy powder is formed as one body in double layer structure, and after immersing the green compact in water- soluble flux, a primary sintering is performed at a low temperature in the atmosphere, and a secondary sintering is performed at a higher temperature after the primary sintering, and an electrode made of a sintered compact is obtd..