PURPOSE: To provide an improved means on the seal up of a space between a turbine rotor vane chip and stator.

CONSTITUTION: In a turbine stage comprising a set of a fixed vanes 1 fixed to the stator 3 of the turbine and supporting a diaphragm 4 and a set of moving vanes 7 arranged succeedingly to the said set of fixed vanes and mounted on a disk 9 fixed to the rotor 6 of the turbine, a set of moving vanes 7 is provided with a seal up packing 10 constituted by plural chambers 11 on its tip. The disk is provided with a suction orifice 16 communicated with the space between the diaphragm and disk and arranged near the peripheral portion of the disk. The suction orifice is connected to an outlet orifice 18 communicated with the downstream of the seal up packing or the chamber of the packing at the tips of these moving blades through ducts 17 passing through a prescribed number of moving vanes 8. The disturbed flow at the root of the fixed vane and the leakage flow between the diaphragm and the rotor are sucked into the orifice.