there will be provided a magnetic recording medium in which film thickness of the dlc layer is 5 nm or less , a tangential force of the magnetic head is small , having excellent durability to sliding property , and there will be obtained a magnetic storage device capable of stable floating of the magnetic head at 10nm or less . there will be used a magnetic recording medium having a primary coat layer , a magnetic layer , and an overcoat layer on a substrate , wherein the overcoat layer is composed of a dlc film , and in an area in which depth from the surface of the dlc film is 13 å or less , there is formed a cn bond .