PROBLEM TO BE SOLVED: To provide a compressor impeller made of an aluminum alloy casting having excellent heat resisting strength so as to withstand high temperature use at about 180°C accompanying high speed rotation at excellent productivity without depending on a cost-increasing means such as compounding. SOLUTION: The compressor impeller made of an aluminum alloy casting for a turbocharger having excellent heat resisting strength has a composition comprising, by mass, 1.4 to 3.2% Cu, 1.0 to 2.0% Mg, 0.5 to 2.0% Ni and 0.5 to 2.0% Fe, and further comprising one or more kinds of metals selected from 0.01 to 0.35% Ti, 0.01 to 0.30% Zr, 0.01 to 0.8% Sc and 0.01 to 0.5% V, and the balance aluminum with impurities, and in which the value of (Cu content)+0.5(Mg content) is ≤3.8mass%, and the secondary dendrite arm spacing is ≤50 μm. The compressor impeller is strengthened by solution treatment and aging treatment. COPYRIGHT: (C)2005,JPO&NCIPI