Hollow curved plate and the combustor of the method for manufacturing the same, and a gas turbine

For the purpose of providing a bending time and the hollow curved plate capable of suppressing generation of cracks in the use environment and the combustor of a method of manufacturing the same, and a gas turbine, a hollow curved plate (20, 50, 70), the first a first plate member The first groove 22 is opposite the second groove 32, the first groove 22 widthwise position of the second groove 32 is substantially aligned, hollow