Provided is a windmill blade that is used in a windmill, in which a constricted portion having a minimum chord length value is formed between a blade root portion and a blade end portion, the constricted portion is formed at a position that is approximately 75% length away from the center of rotation of the windmill blade to the blade end portion, the torsion angle is gradually varied from the blade root portion to the constricted portion, and a flat shape is formed from the constricted portion to the blade end portion.
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