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Provided is series aluminum alloy sheet excellent in strength and bendability. The alloy sheet is an Al—Mg—Si aluminum alloy sheet including Mg: 0.5 to 1.3% by mass, and Si: 0.7 to 1.5% by mass; one or more elements selected from Mn: 0.05 to 0.5% by mass, Zr: 0.04 to 0.20% by mass, and Cr: 0.04 to 0.20% by mass; and Al and inevitable impurities as the remainder of the alloy sheet. Transition-element-based dispersed particles which are present on grain boundaries of the alloy sheet and which have a size of 0.05 μm or more have a number density of 0.001 nm−1 or less. The grain boundaries show a PFZ width of 60 nm or less after the aluminum alloy sheet is subjected to an artificial aging of holding the aluminum alloy sheet at 200 to 250° C. for 10 to 30 minutes.
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