Problem to be solved: To evaluate the quality of a wind turbine blade consisting of a laminated body effectively and easily.A method of evaluating the quality of a wind turbine blade having a hollow structure in which an internal space is surrounded by an outer skin containing a laminate is set to at least a part of an inner wall surface or an outer wall surface of the outer skin of a wind turbine, and the ultrasonic probe is scanned.Based on the position of the ultrasonic probe and the reflected echo, a sectional image corresponding to the scanning line is formed to detect an indication of an echo level greater than the first threshold.The inclination of the indication for the reference line is obtained as the first parameter, and the life or breakdown risk of the wind turbine blade is evaluated based on the first parameter.Diagram
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