To provide a bonded member of an aluminum alloy, which has solved a color tone difference that occurs between a part corresponding to a portion to which an opposing surface is bonded and the other portion, in a film formed by an anodic oxidation treatment of the bonded member of the aluminum alloy.

An aluminum alloy material for use is formed by the bonded member of the aluminum alloy by forming a bonded portion with a frictional stirring technique and includes 0.3-4.0% Mg (mass%, hereinafter the same), 0.2% or less Cu, 0.1% or less Si, 0.1% or less Fe, and the balance Al with unavoidable impurities; and the particle diameter of secondary-phase particles which are dispersed in the aluminum alloy is controlled to 5 μm or less. Thereby, the secondary-phase particles are uniformly dispersed in the part corresponding to the bonded portion of the bonded member of the aluminum alloy even when compared to the other portions, and accordingly variation among pits formed by etching decreases, which can solve the color tone difference in the anodic oxide film.