The bendability of Al-Mg-Si alloy sheets in the T4 condition was examined as a function of alloy composition and cooling rate from the solutionization temperature. The variables in composition was the amount of Mg2Si excess Si, Cu and Cr. The bendability, assessed in terms of macroscopic appearance with naked eyes, increased by the addition of Cr, which was considered to be connected to the effect of grain refinement, i.e., inhibition of grain growth, by the addition. Although large amount of excess Si tended to cause cracking presumably along grain boundaries, it did not always correspond to the macroscopic appearance. The bendability was highest at the slowest cooling rate from the solutionization temperature. However, this was presumed to be associated with the compensation for the bake-hardenability or final strength. The bendability had a closer correlation with bulging property and tensile ductility than yield strength.