The ultrasonic vibration device includes a laminated vibrator (41) in which a plurality of piezoelectric bodies (61) and a plurality of electrode plates (62, 63) are laminated, the outer shape of which is a polygonal column, and both ends of the laminated vibrator. The disposed insulating members (42, 43), the case main body (52) for accommodating the piezoelectric vibrator and the insulating member, and screwed to the opening of the case main body to be fastened, and the laminated vibrator and the insulating member are attached to the case A pressurizing member (51) that pressurizes and fixes in the body, and in the case main body, the laminated vibrator and the insulating member are held in a polygonal column shape, and the laminated vibrator is not in contact with the inner wall of the case main body, and A plurality of positioning member insertion portions (54) for inserting a positioning member (100) for positioning at a position where one end of the insulating member contacts the pressure member.超音波振動デバイスは、複数の圧電体（６１）と複数の電極板（６２，６３）とが積層された、外形が多角柱形状をなす積層振動子（４１）と、積層振動子の両端に配設される絶縁部材（４２，４３）と、圧電振動子および絶縁部材を収容するケース本体（５２）と、ケース本体の開口部に螺着して締結され、積層振動子および絶縁部材をケース本体内で加圧して固定する加圧部材（５１）と、ケース本体内において、積層振動子と絶縁部材とを多角柱形状に保持すると共に、積層振動子をケース本体の内壁に非接触、且つ、絶縁部材の一端が加圧部材に接触する位置に位置決めする位置決め部材（１００）を挿入する複数の位置決め部材挿入部（５４）と、を具備する。
