To ease symptoms such as the stiffness of the shoulders, lumbago and neuralgia of hands and feet by promoting the circulation of the blood by using different kinds of ionization tendency metal rings.

A shaft bar 1 is inserted into different kinds of ionization tendency metal rings A and A' worked in a ring shape, and a grip part 2 is fixed to one end of the shaft bar 1. The metal rings A and A' are separated from each other by insulator rings 3, and the respective rings are isolated from each other. When a roller is repeatedly rolled in an optional place on the skin, a feeble electric current is generated in the human body by an electric potential difference of the different kinds of ionization tendency metal rings A and A', and the flow of the blood can be promoted.