Abstract: An aluminum alloy sheet excellent in terms of formability and bake hardenability which contains in terms of mass %, Mg: 0.2 to 2.0%, Si: 0.3 to 2.0% and Sn: 0.005 to 0.3%, with the remainder being Al and unavoidable impurities. A differential scanning calorimetry curve of the aluminum alloy sheet has an endothermic peak in a temperature range of 150 to 230° C. and an exothermic peak in a temperature range of 240 to 255° C. The endothermic peak corresponds to a dissolution of a Mg—Si cluster and has a peak height of 8 ?W/mg or less, including 0 ?W/mg. The exothermic peak corresponds to a formation of a Mg—Si cluster and has a peak height of 20 ?W/mg or larger.