To provide an ultrasonic probe of inhibiting its heat generation and satisfying both fundamental performance and inhibition of heat generation without disturbance of sensitivity or relative bandwidth of the ultrasonic probe in transmission and reception of ultrasonic waves.

The ultrasonic probe is at least one oscillator transmitting and receiving ultrasonic waves, having a piezoelectric strain constant d33 of 500 pm/V or less and equipped with at least one oscillator containing a piezoelectric material exhibiting 7,00010-15m2/N or over of a product of the piezoelectric strain constant d33 and a piezoelectric voltage constant g33, at least one echo matching layer placed on a first plane of the at least one oscillator and a packing material placed on a second plane opposite to the first plane of the at least one oscillator.