A method for manufacturing an ultrasonic transducer includes: forming a piezoelectric element by laminating a lower electrode, a piezoelectric body, and an upper electrode on a first face of a support film； affixing a reinforcing substrate that covers the piezoelectric element to the first face of the support film； forming a photosensitive resin substrate to a second face of the support film that is on an opposite side from the first face； forming an opening in the resin substrate by irradiating the resin substrate with light； and removing the reinforcing substrate.
