To provide a shaft rod not exhibiting only a slight curve inclination under a dynamic load.

The shaft rod (2) according to the present invention has an especially small mass particularly in a central region. The shaft rod has an upper side edge (11) and a lower side edge (12) having reduced thicknesses, respectively, in the central region of the shaft rod. Finally, a load induced by an acceleration force is smaller than those of conventional structures in the central region. Due to the reduced acceleration force, the extent of the curvature of the central shaft rod is small, and the shaft rod having such the structure is suitable for using for knitting machines operated at very high rates.