An anticorrosion test method for a coated metallic material in which a surface-treated film is provided to a metallic base material , the anticorrosion test method for the coated metallic material comprising: a preparation step (S1) of adding an artificial flaw that penetrates the surface-treated film and reaches the metallic base material at two mutually-separated positions in the coated metallic material ; a first measurement step (S2) of measuring a size of the artificial flaw ; a connection step (S3) of electrically connecting the artificial flaws at the two positions by an external circuit via water-containing materials , each of which is in contact with a respective one of the artificial flaws ; an energization step (S4) of energizing the metallic base material by the external circuit so as to produce a bulge of the surface-treated film in at least one of the artificial flaws at the two positions; a second measurement step (S5) of measuring a size of the bulge of the surface-treated film ; a calculation step (S6) of calculating a degree of progress of corrosion of the coated metallic material in relation to one of the artificial flaws at the two positions having the larger bulge of the surface-treated film on the basis of the size of the artificial flaw , which is measured in the first measuring step (S2), and the size of the bulge of the surface-treated film , which is measured in the second measurement step (S5); and a correction step (S7) of correcting the degree of the progress of the corrosion of the coated metallic material , which is calculated in the calculation step (S6), on the basis of the size of the artificial flaw having the larger bulge of the surface-treated film and correlation, which is calculated in advance, between the size of the artificial flaw and the degree of the progress of the corrosion of the coated metallic material , wherein the correlation is a correction coefficient that corresponds to or is defined according to the size of the artificial flaw . a preparation step (S1) of adding an artificial flaw that penetrates the surface-treated film and reaches the metallic base material at two mutually-separated positions in the coated metallic material ; a first measurement step (S2) of measuring a size of the artificial flaw ; a connection step (S3) of electrically connecting the artificial flaws at the two positions by an external circuit via water-containing materials , each of which is in contact with a respective one of the artificial flaws ; an energization step (S4) of energizing the metallic base material by the external circuit so as to produce a bulge of the surface-treated film in at least one of the artificial flaws at the two positions; a second measurement step (S5) of measuring a size of the bulge of the surface-treated film ; a calculation step (S6) of calculating a degree of progress of corrosion of the coated metallic material in relation to one of the artificial flaws at the two positions having the larger bulge of the surface-treated film on the basis of the size of the artificial flaw , which is measured in the first measuring step (S2), and the size of the bulge of the surface-treated film , which is measured in the second measurement step (S5); and a correction step (S7) of correcting the degree of the progress of the corrosion of the coated metallic material , which is calculated in the calculation step (S6), on the basis of the size of the artificial flaw having the larger bulge of the surface-treated film and correlation, which is calculated in advance, between the size of the artificial flaw and the degree of the progress of the corrosion of the coated metallic material , wherein the correlation is a correction coefficient that corresponds to or is defined according to the size of the artificial flaw . <EOS>