Abstract: An anodizing device has: a power supply drum that supports, in close contact therewith, a web consisting of an anodizable metal and has a part configured with a conductive material, to which the web is closely attached; a counter electrode provided facing the power supply drum; an electrolysis tank filled with an electrolyte, into which part of the power supply drum and the counter electrode are immersed; a protection member formed of a non-conductive material that protects the lateral direction end portions of the web supported by the power supply drum in close contact therewith and a portion of the power supply drum, to which the web is not closely attached, from the electrolyte; and a driver adapted to make the web and the protection member travel concurrently in the electrolyte in synchronization with the circumferential speed of the power supply drum.

Abstract: A solar cell of a module type in which thin-film solar cells having a light absorbing layer made of a compound semiconductor are joined in series on a single substrate. The substrate includes a base made of a ferritic stainless steel, an aluminum layer formed on at least one surface of the base, and an insulation layer having a porous structure obtained by anodizing a surface of the aluminum layer. The insulation layer exhibits compressive stress at room temperature.