A method of fabricating a steam turbine blade equipped with an erosion shield, comprising the steps of: preparing constituent elements for a steam turbine blade equipped with an erosion shield, characterised by: the steam turbine blade having a blade part, the erosion shield to be joined to a leading edge part of the blade part on the tip side thereof, and a shim to be disposed between the blade part and the erosion shield at the time of the electron beam welding, wherein the blade part, the erosion shield and the shim have a thickness larger than the thickness of the final shape of the blade part and wherein any of the constituent elements has a backing part to serve as a backing for preventing burn through of molten metal at the time of the electron beam welding; and further characterised by the following steps: assembling the constituent elements so that the backing part is arranged on the back side of a groove; performing single-layer welding by use of downward electron beam welding to the leading edge part of the blade part, the erosion shield and the shim while utilizing the backing; and applying a machining work including removal of parts of the blade part, parts of the erosion shield and the backing part after the electron beam welding so as to be finished up in the final shape of the blade part as a target. preparing constituent elements for a steam turbine blade equipped with an erosion shield, characterised by: the steam turbine blade having a blade part, the erosion shield to be joined to a leading edge part of the blade part on the tip side thereof, and a shim to be disposed between the blade part and the erosion shield at the time of the electron beam welding, wherein the blade part, the erosion shield and the shim have a thickness larger than the thickness of the final shape of the blade part and wherein any of the constituent elements has a backing part to serve as a backing for preventing burn through of molten metal at the time of the electron beam welding; and further characterised by the following steps: assembling the constituent elements so that the backing part is arranged on the back side of a groove; performing single-layer welding by use of downward electron beam welding to the leading edge part of the blade part, the erosion shield and the shim while utilizing the backing; and applying a machining work including removal of parts of the blade part, parts of the erosion shield and the backing part after the electron beam welding so as to be finished up in the final shape of the blade part as a target. the steam turbine blade having a blade part, the erosion shield to be joined to a leading edge part of the blade part on the tip side thereof, and a shim to be disposed between the blade part and the erosion shield at the time of the electron beam welding, wherein the blade part, the erosion shield and the shim have a thickness larger than the thickness of the final shape of the blade part and wherein any of the constituent elements has a backing part to serve as a backing for preventing burn through of molten metal at the time of the electron beam welding; and further characterised by the following steps: assembling the constituent elements so that the backing part is arranged on the back side of a groove; performing single-layer welding by use of downward electron beam welding to the leading edge part of the blade part, the erosion shield and the shim while utilizing the backing; and applying a machining work including removal of parts of the blade part, parts of the erosion shield and the backing part after the electron beam welding so as to be finished up in the final shape of the blade part as a target. assembling the constituent elements so that the backing part is arranged on the back side of a groove; performing single-layer welding by use of downward electron beam welding to the leading edge part of the blade part, the erosion shield and the shim while utilizing the backing; and applying a machining work including removal of parts of the blade part, parts of the erosion shield and the backing part after the electron beam welding so as to be finished up in the final shape of the blade part as a target.