To prevent loss caused by secondary flow and downsize the whole device by twisting a blade near the end wall surface so as to coincide with the direction of boundary layer flow generated near the end wall surface part of the blade.

One end of a stator blade 1 is fixed onto the end wall surface 3 formed at a part of a shroud. In this case, the stator blade 1 is twisted near the contact parts with the end wall surface 3 at one end and the end wall surface at the other end so as to coincide with the direction of boundary layer flow 4. As a result, the parts near the end wall surface contact parts of the blade 1 are twisted large with different twist angles from a twist angle at a center part opposed to main flow from the view of a plurality of longitudinal sections of the stator blade 1. The boundary layer flow 4 thereby flows along the blade profile, so that the development and growth of secondary flow are suppressed, and the increase of loss is prevented to attain high efficiency while realizing a compact device.