Patent ID: 8827646

Claim:
A gas turbine blade in which cooling channels are formed inside the turbine blade, and the turbine blade is cooled by causing cooling air to circulate through the cooling channels, wherein the cooling channels comprise: a plurality of straight channel-like base-side elongated holes that extend in a longitudinal direction at a base side of the turbine blade, a plurality of straight channel-like tip-side elongated holes that extend in a longitudinal direction at a tip side of the turbine blade, and a plurality of communicating hollow portions each having a spherical or spheroidal shape and interposed at respective connection portions that connect the base-side elongated holes and respective corresponding tip-side elongated holes to individually allow the two types of elongated holes to communicate with each other, and the respective communicating hollow portions having larger cross-sectional areas than the channel cross-sectional areas of the two types of elongated holes, wherein the communicating hollow portions are formed so as to match the position of a platform portion of the turbine blade, and wherein lengths from tip ends of the plurality of the tip-side elongated holes to the respective communicating hollow portions are set to be different.