Abstract: A copper alloy for use in an electrical and electronic parts contains Fe of 1.8-2.0 weight %, P of 0.025-0.040 weight %, Zn of 1.7-1.9 weight %, Sn of 0.40-1.0 weight %, and Ca of 0.0001-0.01 weight %, the balance being Cu and inevitable impurities. Further the copper alloy may contain one kind or two kinds of the elements selected from the group of Cr of 0.001-0.01 weight % and Mg of 0.001-0.01 weight %, by 0.001-0.01 weight % at a total amount. This copper alloy for use in electrical and electronic parts can dissolve the prior problem that cracking is apt to occur on the ingot during heating on the hot working process or during hot working, and can prevent a short-circuit due to the migration phenomenon of copper which is apt to occur with the high density integration of the electrical and electronic parts made of copper alloy, and further can improve the tool service life (wear resistance) of the die and can decrease the producing cost thereof.