The surface of the tank used two sides coating steel plate which becomes outside surface when the tank manufacturing is over, is formed with a coating film containing a vestopal (A) which includes hydroxyl, at least one kind of cross linkers (B) chosen from amine resin and soluble phenolic resin consisting group, and a tank used coating color (I) which includes aluminum paint (C1) or white paint (C2) with a special ratio, and the surface which becomes the inside surface when the tank manufacturing is over, is formed with a coating film containing crystalline vestopal particulates (D) which includes the terephthalic acid glycol ester monomer as main body, a crystalline vestopal particulate (E) which includes the terephthalic acid butanediol ester as main body, and a tank used coating color(II) whose dissolvability to the particulate (D) and the particulate (E) is less than 5 mass percentage below 40 centigrade and is more than 99 mass percentage above 170 mass percentage.