Provided is an ultrasonic probe (4) comprising a plurality of impedance matching elements (7) connected to a plurality of ultrasonic transducers (a1-a2n) and having a prescribed matching frequency in a transmission path (6) for reception signals. In order to reduce the effect of ultrasonic transmission/reception signal angles, caused by arrangement positions in an array (11) for the corresponding ultrasonic transducer, the matching frequencies for the plurality of impedance matching elements (7) have a distribution such that the matching frequencies increase the closer the corresponding arrangement position is to the center. Reception signals received by the ultrasonic transducers (a1-a2n) for the ultrasonic probe (4) pass through each impedance matching element (7) comprising a prescribed frequency distribution and arranged in each transmission path (6), and as a result: the effect of displacement of a central frequency for each reception signal is compensated, the reception signals are sequentially output to a diagnostic device main body (5), and reception data is generated； and a high image-quality ultrasonic image is generated on the basis of this reception data.
