Patent ID: 7819630

Claim:
A steam turbine blade comprising: an airfoil; a blade root attached to a turbine rotor and having plural stages of hooks in the radial direction of said turbine rotor; and a platform provided between said airfoil and said blade root, wherein said blade root is shaped such that said blade root is inserted straight in at a predetermined angle α larger than 0° relative to the axial direction of said turbine rotor, wherein respective values of said angle α and an angle θ formed by a load bearing surface of each of said hooks, which is positioned at the outer peripheral side in the radial direction of said turbine rotor, relative to a circumferential surface as viewed in the axial direction of said turbine rotor are set to fall within a region specified by the following formulas: 500≧α×θ≧0 90>θ≧0 90>α>0 wherein the turbine blade comprises a shroud at a tip of said blade, wherein said shroud is formed integrally with said airfoil or is integrally combined with said airfoil by a tenon, and wherein the shroud is structured such that adjacent shrouds are tied in contact with each other while contact pressure is generated between the adjacent shrouds by an elastic restoring force caused by a torsional deformation given to the turbine blade.