PROBLEM TO BE SOLVED: To reduce restrictions in structural soundness diagnosis of a structure and improve defect detection accuracy. A structural soundness diagnosis system according to an embodiment is a structure having a plate-shaped first inspection area having no bent portion and a second inspection area including a bent plate-shaped portion. It is a structural soundness diagnosis system that performs structural soundness diagnosis of the above, and is an ultrasonic vibrator that oscillates ultrasonic waves in the first inspection area, and the transmitted waves of the ultrasonic waves that have passed through the first inspection area. An ultrasonic sensor that detects at least one waveform of the reflected wave of the ultrasonic waves reflected in the first inspection area, a strain sensor that detects the amount of distortion in the second inspection area, and an ultrasonic sensor that detects it. A signal processing unit that obtains an index indicating the soundness of the structure including the first inspection area and the second inspection area based on the generated waveform and the strain amount detected by the strain sensor. And have. [Selection diagram] Fig. 7
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