A fixed blade has a chord line inclined downstream in a rotation direction of a rotor vane throughout a radial direction. An average of an installation angle on an outer peripheral side of the fixed blade from a midpoint of a straight line extending in the radial direction from an outer peripheral end of an upstream edge of the fixed blade to an outer peripheral surface of the fixed hub is less than an average of the installation angle on an inner peripheral side of the fixed blade from the midpoint of the straight line, where the installation angle is formed by the chord line of the fixed blade with respect to a plane perpendicular to an axis.