The inventive ring brush is provided with a brush piece assembly and a ring member for attaching the brush piece assembly to a brush shaft. The brush piece assembly comprises a ring-shaped brush base formed from a synthetic resin material and a linear brush piece which extends radially on the outer circumferential side of the ring member. The brush piece is attached to the brush base and is formed from the same synthetic resin material as the brush base. The ring member is formed from a pair of retaining members for sandwiching the brush piece assembly from the front and rear in the axial direction thereof.