Patent ID: 8469659

Claim:
A turbine blade cascade endwall that is positioned on a tip side of a plurality of turbine stator blades arranged in a ring form, wherein, assuming that 0% Cax is a leading edge position of the turbine stator blades in an axial direction, that 100% Cax is a trailing edge position of the turbine stator blades in the axial direction, that 0% pitch is a position on a suction surface of the turbine stator blades, and that 100% pitch is a position on a pressure surface of a turbine stator blade facing the suction surface of the turbine stator blade, a convex portion that is gently swollen as a whole and extends substantially parallel to the axial direction, within a range from substantially −50% Cax to +50% Cax and within a range from substantially 0% pitch to substantially 50% pitch, is provided between one turbine stator blade and another turbine stator blade arranged adjacent to this turbine stator blade, and an apex of the convex portion is formed along the axial direction within a range from substantially −20% Cax to substantially +20% Cax.