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.