To retain a smooth sliding state relative to a curtain rail for a long period and prevent sliding noise and collision noise without causing an increase in the cost in a ring runner.

This ring runner has a wooden ring part 2 slidably and externally fitted to a rod-shaped wooden curtain rail 5 and a hanger part 3 provided to the ring part 2 for hanging a curtain, wherein the internal circumferential part of the ring part 2 is internally fitted with a resin slide cover 4 at least including an area serving as a top side and inscribed with the ring part 2 beyond its semicircle.