PURPOSE: To impact large damping force to a turbine blade having an arch shape.

CONSTITUTION: In a turbine blade 1 having a shape wherein a blade body part 2 is in an arched shape in a rotation direction, structure is made so that shelves 3 each other on adjoining blade upper ends can be bitten, that is, the blade back side end 3a of one side shelf and the blade antinode side end 3b of the other side shelf can be bitten on an end part, to make these ends of a shelf 3 be pushed to each other in a radial direction by the deformation of the blade body part 2 due to centrifugal force at the time of rotation.