To increase the strength against vibration by increasing the restricting force of contact surface of an adjacent shroud.

The contact surface of a shroud 11 formed integrally with the blade end part of an integral shroud vane 10 with an adjacent shroud 11 is formed with a triangular protruded surface 12 and recessed surface 13. Also the apex angle θ1 of the protruded surface 12 is increased layer than the apex angle θ2 of the recessed surface 13, and the protruded surface 12 or recessed surface 13 is fitted closely to the recessed surface 13 or protruded surface 12 of the adjacent shroud 11 in assembling the integral shroud vane 11 into the outer periphery of a rotor. Then the assembly is raised. Thus the restricting force of the contact surface of the adjacent shroud 11 is increased, and the structure damping of the integral shroud 10 vane is increased so as to increase a strength against vibration.