To provide a ring runner which uses an outer metallic ring and can surely prevent damage to a curtain rail due to the ring runner.

The ring runner for a decorative curtain rail has an inner ring 17 fitted inside the outer metallic ring 16 and is movably supported by the curtain rail 11 by putting the curtain rail 11 through the inner ring 17, wherein inner projected lines 18b for preventing contact between the curtain rail 11 and the outer ring 16 when the ring rubber 14 is moved by inclination are provided at the inner circumferential part of the inner ring 17, and a put-through hole 20 for putting the curtain rail 11 through between the inner projecting lines 18b is also provided into an oval shape.