An ultrasonic radiator , comprising: a plurality of plate-like elements each having, on a front side or a back side, a radiation surface from which ultrasonic waves are emitted; a supporter that holds the plurality of plate-like elements in an arrangement in which the respective radiation surfaces in different directional orientations are directed toward the same location; and a first adhesive with which the plurality of plate-like elements are bonded to the supporter , wherein the plurality of plate-like elements each include a plurality of vibratory elements that are variously located in the radiation surface and that generate ultrasonic waves, the plurality of plate-like elements each include an element substrate that extends along the radiation surface and includes the plurality of vibratory elements , and a cavity member that extends along the radiation surface and has a plurality of openings each of which is covered with a corresponding one of the plurality of vibratory elements , the element substrate includes a piezoelectric layer that produces stress along the radiation surface , and vibrates by regions corresponding to the plurality vibratory elements being bent and distorted, the supporter , the cavity member , and the element substrate are stacked in this order in a direction the radiation surface faces, and the first adhesive is applied to lateral surfaces of each of the plurality of plate-like elements and lateral surfaces of the cavity member that are located on both sides with the radiation surface therebetween. a plurality of plate-like elements each having, on a front side or a back side, a radiation surface from which ultrasonic waves are emitted; a supporter that holds the plurality of plate-like elements in an arrangement in which the respective radiation surfaces in different directional orientations are directed toward the same location; and a first adhesive with which the plurality of plate-like elements are bonded to the supporter , wherein the plurality of plate-like elements each include a plurality of vibratory elements that are variously located in the radiation surface and that generate ultrasonic waves, the plurality of plate-like elements each include an element substrate that extends along the radiation surface and includes the plurality of vibratory elements , and a cavity member that extends along the radiation surface and has a plurality of openings each of which is covered with a corresponding one of the plurality of vibratory elements , an element substrate that extends along the radiation surface and includes the plurality of vibratory elements , and a cavity member that extends along the radiation surface and has a plurality of openings each of which is covered with a corresponding one of the plurality of vibratory elements , the element substrate includes a piezoelectric layer that produces stress along the radiation surface , and vibrates by regions corresponding to the plurality vibratory elements being bent and distorted, the supporter , the cavity member , and the element substrate are stacked in this order in a direction the radiation surface faces, and the first adhesive is applied to lateral surfaces of each of the plurality of plate-like elements and lateral surfaces of the cavity member that are located on both sides with the radiation surface therebetween. <EOS>