Ultrasonic oscillator unit having electrode part provided in ultrasonic oscillator, three or more connectors, and three or more electrode wiring boards mounted to three or more connectors and electrically connected to electrode part

An ultrasonic oscillator unit comprising:

• an ultrasonic oscillator array in which a plurality of ultrasonic oscillators having a rod shape are arranged in a circular-arc shape while aligning in a longitudinal direction of the rod shape;
• an electrode part that is provided in at least one end surface of the plurality of ultrasonic oscillators perpendicular to the longitudinal direction and has a plurality of electrodes electrically connected to the plurality of ultrasonic oscillators, respectively;
• a circular-arc backing material layer disposed on a rear surface of the ultrasonic oscillator array that becomes a center side of the circular-arc shape;
• three or more electrode wiring boards electrically connected to the plurality of electrodes of the electrode part;
• and
• three or more connectors to which a plurality of cables are connected, respectively,
• wherein the three or more electrode wiring boards are respectively mounted to the three or more connectors and electrically connect the plurality of electrodes of the electrode part to the plurality of cables, and
• wherein the three or more connectors are arranged in a width direction of the circular-arc backing material layer in the longitudinal direction on a rear surface side of the circular-arc backing material layer opposite to the ultrasonic oscillator array.