A ultrasonic oscillator unit including an ultrasonic oscillator array in which a plurality of oscillators are arranged in a circular-arc shape； an electrode part that is provided on at least one end surface of the plurality of oscillators perpendicular to a longitudinal direction thereof and that is electrically connected with the oscillators； a backing material layer that is disposed on a rear surface of the ultrasonic oscillator array； and a cable wiring part including a flexible printed wired board. The flexible printed wired board includes a cable connecting part that extends to a lower side of the backing material layer, is separated into a plurality of belt-like pieces, and has, in a comb shape, a plurality of strip-like electrode parts in which at least one electrode pad is linearly disposed in the longitudinal direction of each of the belt-like pieces.
