To provide an ultrasonic transducer array or the like capable of forming an ultrasonic beam whose side lobe is reduced without imposing excessive load on an electronic circuit.

The ultrasonic transducer array is a plurality of groups of ultrasonic transducers which are vibrated with different amplitudes with respect to the same application voltage. The ultrasonic transducer array includes a plurality of groups of the ultrasonic transducers 10 to 14 arranged differently from each other depending on the amplitudes of the respective groups and a packing member 18 for supporting the plurality of groups of the ultrasonic transducers.