To provide a cord for reinforcing a rubber, having a high flexural fatigue resistance and dimensional stability, and also a rubber article containing the cord such as a rubber belt.

This cord for reinforcing the rubber is obtained by arranging a plural number of smaller primary twisted cords around a core fiber and giving a final twist to them. The directions of the primary twist of the smaller cords and the final twist are the same and the core fiber is primary twisted in the reverse direction of that of the smaller cords or not twisted. The core fiber and smaller cords are made of glass fibers. The rubber article containing the reinforcing cord is provided.