PURPOSE: To promote stirring of cooling air so as to improve heat transmitting property by forming a cooling flow passage in a turbine blade, providing supporting column bodies for connection together both side walls in the cooling flow passage, and making the back end surface on the downstream side of the cooling passage of the supporting column body to cross at an acute angle opposing to a side surface.

CONSTITUTION: The blade main body 10 of a turbine blade which is rotated by means of high temperature gas is formed as a hollow structure, a cooling passage 13 is formed between the blade main body 10 and an inserting member 11. A side wall 12 is provided with a blowout hole for cooling its outer surface by blowing out cooling air appropriately. Supporting column bodies 14A, 14B for connecting the inserting member 11 and the side wall 13 to each other at a plurality of positions are provided between the inserting member 11 and the side wall 12 in crossing condition. The supporting column body 14A and the like are formed in each triangle shape, and an inner angle along a cross section in the side surface and the rear surface of the supporting column body 14A and the like is set to 90 degree or less. Turbulence is then generated in the vicinity of the rear face, so that stirring of cooling air is promoted, and new cooling air of a low temperature is fed in so as to improve cooling effect.