Ultrasonic transducer, ultrasonic probe, diagnostic device, and electronic instrument

An ultrasonic transducer comprising:

• a plurality of ultrasonic elements being arranged on the ultrasonic transducer with predetermined intervals,
• the plurality of ultrasonic elements including
• “m” first ultrasonic elements including first diaphragms, the “m” first ultrasonic elements being configured and arranged to transmit and receive ultrasonic waves, where “m” representing the number of the first ultrasonic elements and is an integer of 1 or more, each of the first diaphragms having a first area and a piezoelectric body that is disposed on the first area, and
• “n” second ultrasonic elements including second diaphragms, each of the “n” second diaphragms having a second area and a piezoelectric body that is disposed on the second area, the second area being smaller than the first area, the “n” second ultrasonic elements being configured and arranged to transmit and receive the ultrasonic waves, where “n” representing the number of the second ultrasonic elements and is an integer larger than “m”,
• the “m” first ultrasonic elements being electrically connected in series in a case where “m” is an integer of 2 or more,
• the “n” second ultrasonic elements being electrically connected in series,
• B/A being within a range of 0.9 to 1.1, when a total sum of the first areas is “A” and a total sum of the second areas is “B”.