Silver complex oxide thin films, which contain V, Cr, Mo, W, Si, Sn, P, Te, and I as constituent elements, are synthesized by anodic oxidation of silver metal films. It is found that Ag3VO4, Ag4SiO4, and Ag3PO4films show good photochromic properties. An x‐ray photoelectron spectroscopy study on a Ag3PO4film shows that the silver ions are reduced and PO4tetrahedra are condensed by visible light irradiation and that the inverse reaction is produced by heating.