A method for producing an ultrasonic transducer according to the present invention includes an arrangement determination step (S2) of determining an arrangement of piezoelectric elements in a stack on the basis of mechanical quality factors of the respective piezoelectric elements; and an assembly step (S3) of assembling the stack in which the piezoelectric elements are arranged according to the arrangement determined in the arrangement determination step, a horn, and a back mass. In the arrangement determination step (S2), the arrangement of the piezoelectric elements is determined so that the difference in mechanical quality factor between the piezoelectric elements adjacent in the longitudinal direction is within 5% of a mean value of the mechanical quality factors of the piezoelectric elements.