anode to thereby perform electropolishing treatment on a surface of the aluminum material the method including performing as pretreatment for the electropolishing treatment anodic oxidation treatment performing during the electropolishing treatment bubble diffusion preventing treatment and performing as post treatment for the electropolishing treatment film peeling treatment for an electropolishing film application_number US 201415102985 A description now an embodiment of a first invention is described with reference to the conceptual views of the invention illustrated in fig1 further an embodiment of a second invention is described with reference to the conceptual views of the invention illustrated in fig2 further a preferred embodiment of a third invention is described fig1 are each an explanatory view for illustrating a concept of a method of performing electropolishing treatment on an aluminum material according to the first invention and a treatment process including an anodic oxidation treatment step a as pretreatment and an electropolishing treatment step b is illustrated in fig1 in the anodic oxidation treatment step a a pretreatment solution 3 for anodic oxidation treatment to be performed as pretreatment is filled into a pretreatment tank 2 arranged separately from an electrolytic treatment tank 1 in the electropolishing treatment step b an aluminum material 4 serving as a material to be treated is set as an anode and a dc voltage is applied between the anode and a cathode 5 serving as a counter electrode of the aluminum material 4 to form an anodic oxide film 6 on the surface of the aluminum material next in the electropolishing treatment step b of fig1 an electrolytic treatment solution 7 is filled into the electrolytic treatment tank 1.