A 6000-series aluminum alloy sheet used for structural materials such as structural materials and reinforcing materials increased in the strength without deteriorating bendability is provided. The strength of the Al-Mg-Si alloy sheet after BH is increased without deteriorating the bendability also after natural aging by defining the microstructure such that the content of Mg and Si are balanced so as to satisfy (Mg content)+(Si content)>=1.5% and 0.6=<(Mg content)/(Si content)=<2.0, and an exothermic peak of a predetermined height is present only by one in a temperature range of 230 to 330 DEG C of a differential scanning calorimeter measurement curve of the sheet shown in FIG. 1.