Patent ID: 8546997

Claim:
An ultrasonic sensor comprising: a substrate having an opening therein; a support film disposed on the substrate and covering the opening; a piezoelectric body disposed on an inner region of the opening in a plan view seen in a thickness direction of the support film, the piezoelectric body being formed by laminating a lower electrode, a piezoelectric film, and an upper electrode in this order on the support film, the piezoelectric body having a width that is smaller than that of the opening in a direction perpendicular to the thickness direction; a first resin material forming a first space closed off from an outside space, the first space being formed by the first resin material and the support film in at least a region in which the opening is formed as seen in the plan view, the first resin material having an contacting portion overlapping the opening, and configured to contact with a test object; a second resin material forming a second space communicating with the first space, the second space being closed off from the outside space, at least a portion of the second resin material including a flexible portion having lower rigidity than the support film in the film thickness direction, the flexible portion being configured to bulge toward the outside space; and an ultrasonic wave transmitting medium filling the first space and the second space.