PURPOSE: To obtain a steam turbine moving blade having excellent strength characteristics and showing superior erosion resistance comparable to that of stellite, by precipitating a hard phase in an α-phase in the vicinity of a surface, to be in contact with working steam, of a steam turbine moving blade having an α+β structure of a Ti-6Al-4V alloy as base material.

CONSTITUTION: A material for a steam turbine moving blade composed of an α+β phase of a Ti-6Al-4V alloy is formed. Subsequently, the surface, of this moving blade, to be in contact with working steam is subjected to dry polishing work, e.g., by dry belt polishing of grain size No.80. In this way, the hard phase 2 is precipitated in the α-phase 1', in the vicinity of the polished surface, in the α+β phase 3 constituting the material as illustrated. As a result, the steam turbine moving blade having superior characteristics as mentioned above can easily be manufactured in high quality.