High strength aluminum alloy material and a method of manufacturing

To provide a strength and high-strength aluminum alloy which is excellent in both surface quality. A Zn: 5.0% (mass%, hereinafter the same) to 6.5% or less, Mg: less than 0.50% or more 1.0%, Cu: less than 0.20%, Fe: 0.30 % or less, Si: 0.30% or less, Mn: less than 0.05%, Cr: less than 0.05%, Zr: less than 0.05% or more 0.20%, Ti: 0.001% to 0.05 % or less and the balance has a chemical composition consisting of Al and unavoidable impurities. Strength is at least 300 MPa, the average value of the width of the fibrous crystal grains composed of fibrous tissue is 30μm or more. .BACKGROUND