Turbine blades, manufacturing methods of turbine blades, and gas turbines and processes

A turbine blade, a method for manufacturing a turbine blade, and a gas turbine. In a turbine blade provided with a cooling passage along the blade height direction, the cooling passage has: a first cooling hole, one end of which is open to the tip side and along the blade height direction The inner diameter is the same; and the second cooling hole, one end of which communicates with the other end of the first cooling hole without height difference, and the inner diameter increases toward the base end, from one end of the first cooling hole to the first cooling hole and The length to the communicating position of the second cooling hole is 40 percent to 60 percent of the length from one end of the first cooling hole to the gas passage surface on the base end side

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