A wideband and high sensitive ultrasonic probe adaptable to harmonic imaging by improving the sensitivity of vibrators in a wider frequency band without hindering the operation of piezoelectric materials. The ultrasonic probe includes: a vibrator array including plural vibrators for transmitting and/or receiving ultrasonic waves, each of the plural vibrators including plural piezoelectric materials arranged in parallel between a first electrode and a second electrode and having different frequency constants from one another; at least one acoustic matching layer provided on a first surface of the vibrator array; and a backing material provided on a second surface opposite to the first surface of the vibrator array.