PURPOSE: To manufacture an aluminum alloy excellent in formability by executing solution, precipitation and softening treatment at specified temps. to an allay having a specified chemical compsn. subjected to homogenizing treatment and to the subsequent hot and cold rolling.

CONSTITUTION: An allay ingot contg., by weight, 0.5 to 1.8% Mg, 0.2 to 1.2% Si, 0.1 to 0.8% Cu and 0.01 to 0.45% Cr, and the balance Al with inevitable impurities is subjected to homogenizing treatment, is thereafter subjected to hot rolling and cold rolling, next subjected to solution treatment at 470 to 550°C, is subsequently cooled, furthermore subjected to precipitating treatment at 120 to 180°C, successively subjected to working of 10 to 50% and is thereafter subjected to softening treatment at 360 to 500°C. In this way, the objective aluminum allay excellent in formability can be manufactured.