An ultrasonic diagnosis/treatment device includes a placement surface formed of an inner surface of a sphere； a plurality of ultrasonic transducers placed on the placement surface so that a focal point of an ultrasonic wave to be emitted is located at a position that is near an outside of an outer surface of a subject and is spaced apart from the outer surface by a predetermined distance； and a control part configured to control transmission and reception of each of the ultrasonic transducers. The control part includes a diagnosis mode in which at least one ultrasonic transducer is oscillated toward a diagnosis region within a subject and a reflected wave from the diagnosis region is received by the at least one ultrasonic transducer to visualize the reflected wave, and a treatment mode in which the at least one ultrasonic transducer is oscillated toward an inside of the subject.
