RING MEMBER, RING MEMBER FOR FISHING LINE, GUIDE FOR FISHING LINE, FISHING ROD AND RING MEMBER FOR FIBER MACHINE

PROBLEM TO BE SOLVED: To provide a ring member, a ring member for a fishing line, a guide for a fishing line, a fishing rod and a ring member for a fiber machine.SOLUTION: There is provided an annular ring member 1 in which, in a sectional view from the inner periphery to the outer periphery, the inner peripheral side of a portion having a maximum width W is formed into a curved surface, and the portion having the maximum width is located to the inner peripheral side in the thickness direction between the inner periphery and the outer periphery, thereby allowing a region where the ring member 1 and a thread-like member slide in contact with each other to be increased. This can prevent vertical pressure applied to the inner peripheral surface 2 of the ring member 1 when the thread-like member slides on the inner peripheral surface 2 of the ring member 1 from being increased, so that abrasion of the thread-like member is suppressed, making the thread-like member hard to be broken.