A short axis oscillating ultrasonic probe having a sealed container. A piezoelectric element group is housed within the sealed container and is arranged in a long axis direction. The piezoelectric group having an acoustic lens. The acoustic lens is provided on a rotational retention base which rotates and oscillates in the short axis direction of the piezoelectric element group. A projecting section is respectively provided on both end sides of the acoustic lens positioned in the long axis direction wherein each projection section includes an arc shape on a tip section thereof along a profile of an inner peripheral shape defined by a cover portion of the sealed container for absorbing unwanted ultrasonic waves that propagate in the long axis direction between the ultrasonic wave transmitting and receiving surface and an inner circumferential surface of the sealed container.
