To provide a vane which is effective in reducing attackability of a partner material, the manufacturing method of the vane, and a device for controlling open/close timing of a valve while securing wear resistance.

The base material of the vane is a ferrous material, and a nitrided cured layer, of which the surface stiffness is set at a low level of Hv 900 to 1,200 by nitriding, is formed on the surface of the vane. Then, a compound layer (what is called a white layer) of which the main component is a ferrous nitride is not substantially formed on the frontmost surface of the vane.