The invention relates to a transmission belt. In a transmission belt provided with a row of rings, contact between a column of a single member caused by eccentricity and a side end portion of the rowof rings is reduced. The conveyor belt is formed by arranging a plurality of plate-sheet-shaped single members and bundling the single members into a ring shape by using a row of belt-shaped rings, and each single member comprises a column part through which the row of rings are inserted; and an interlocking edge, the interlocking edge is a boundary area where the plate thickness of the single component is changed; and an insulating member provided on one surface of the unit member in the plate thickness direction, two ends of an inner side portion of the column portion, which is inserted through the row of rings, are provided with curved portions having a predetermined radius of curvature along a plane parallel to the row of rings, and a curved portion is provided on a front side of one end of the inner side portion, which is provided with the interlocking edge, and on a rear side of the other end of the inner side portion, which is not provided with the interlocking edge.