To provide an ultrasonograph by which highly fine ultrasonic images are obtained even when functional degradation, such as a reduction in sensitivity, of an organic piezoelectric element occurs, an ultrasonic diagnostic system, and a jig for examinations.

A degree of the reduction in receiving sensitivity of the organic piezoelectric element 21 converting second ultrasonic signals into receiving electric signals is detected in advance. The ultrasonic images are created by correcting the degree of a reduction in the receiving sensitivity.