Problem to be solved: to prevent the turbine performance from deteriorating due to pressure difference between the working medium and the cooling medium, and to ensure the soundness of the turbine stator blade.The turbine stator blade 100 disposed in the working fluid flow path 14 in the casing of the gas turbine isThe blade effective portion 110 disposed in the working fluid flow pathA plate portion 123 to be connected to the radial outer end of the wing effective portionThe front hook wall 121a extending from the upstream end side of the plate-like portion 123 in the radial direction and in the circumferential directionThe front hook protrusion 121b which is connected to the outer radial portion of the front hook wall portion 121a and engages with the casingAn outer ring side wall 120 havingAn inner ring side wall 130 connected to the radially inner end of the wing effective portionIs provided.Diagram
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