| 摘要 |
A magnetic recording medium is disclosed which comprises a support and, provided thereon, a magnetic layer containing a binder and a back coat layer containing carbon black on the side opposite to the magnetic layer. The magnetic layer contains a copolymer comprising a unit derived from vinyl monomer having sulfonic acid salt group and a unit derived from vinyl carboxylic acid ester having a hydroxyl group, the back coat layer has Ra, an average surface roughness of from 0.010 to 0.035 mu m, and not less than 70% by weight of the carbon black has an average particle diameter of from 10 to 30 mu m.
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