| 摘要 |
A long-life rolling element which prevents solid lubrication films from being broken away near the roots. In a rolling element coated with a solid lubrication film in the form of a molybdenum disulfide sputter film, the solid lubrication film (3) is divided into two layers, a boundary layer (3A) corresponding to the boundary between the film and a roller (2) and an upper layer (3B), the boundary layer (3A) having an oxygen content of 5-30%, the upper layer (3B) having an oxygen content of 3% or less in atomic percentage.
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