An aluminum alloy material of the present disclosure has an alloy composition containing Mg: 0.50% by mass or more and 6.0% by mass or less, Fe: 0% by mass or more and 1.50% by mass or less, Si: 0% by mass or more and 1.0% by mass or less, one or more selected from Cu, Ag, Zn, Ni, Ti, Co, Au, Mn, Cr, V, Zr and Sn: 0% by mass or more and 2.0% by mass or less in total, with the balance being Al and inevitable impurities. The aluminum alloy material has a fibrous metallographic structure in which crystal grains extend so as to be aligned in one direction, and an average value of sizes perpendicular to longitudinal direction of the crystal grains is 310 nm or less in a cross section parallel to the one direction.