An ultrasound vibration device 2 includes a stacked transducer 41 in which a plurality of piezoelectric substances 61 and a plurality of electrode plates 62 and 63 are stacked, an external shape of the stacked transducer 41 being formed in a polygonal prism shape, insulators 42 and 43 disposed at both ends of the stacked transducer 41, a case main body 52 that houses the piezoelectric transducer 61 and the insulators 42 and 43, a pressurizing member 51 screwed and fastened to an opening portion of the case main body 52 to pressurize and fix the stacked transducer 41 and the insulators 42 and 43 in the case main body 52, and a plurality of positioning-member insertion sections 54 into which a positioning member 100 is inserted, the positioning member 100 retaining, in the case main body 52, the stacked transducer 41 and the insulators 42 and 43 in the polygonal prism shape and positioning the stacked transducer 41 in a position where the stacked transducer 41 is not in contact with an inner wall of the case main body 53 and one ends of the insulators 42 and 43 are in contact with the pressurizing member 51.
