Method for producing magnetic recording medium

A method for producing a magnetic recording medium comprising steps of treating a magnetic recording medium which comprises a non-magnetic substrate and a ferromagnetic metal layer formed on said substrate in an atmosphere kept at a temperature of at least 50.degree. C., with applying a tension of 1 gf. or less per 10 mm width to said magnetic recording medium in a treating time which is in a range on or above a line having a slope of at least 5000 in terms of .DELTA.ln(L)/.DELTA.(1/T) and passing a point of 0.5 second at 100.degree. C., when a natural logarithm of a residence time L (hours) {ln(L)} is Arrhenius plotted against an inverse of an absolute temperature T (1T), where .DELTA.ln(L)/.DELTA.(1/T) is derived from {ln(L.sub.1)-ln(L.sub.2)}/{(1/T.sub.1)-(1/T.sub.2)} in which L.sub.1 and L.sub.2 are two different residence times at the absolute temperatures T.sub.1 and T.sub.2, and heating said medium over a heated roll kept at a temperature of at least 60.degree. C. with contacting said medium to said roll, where said treatment in the atmosphere kept at a temperature of at least 50.degree. C. and said heating over the heated roll are carried out at least one time.