An ultrasound transducer unit includes: an ultrasound element 6 a substrate 5 a signal transmission cable 20 a cylindrical metal shield member 30 that has a large-diameter portion 30a, a small-diameter portion 30b, and a step portion 30c, in which the large-diameter portion 30a covers an outer circumference of the substrate 5 ground wiring 35 that electrically connects the substrate 5 and an outer circumferential face 30g of the metal shield member 30 and an opening portion 33 formed in the step portion 30c or the small-diameter portion 30b. The ground wiring 35 is extended to outside the metal shield member 30 from inside the large-diameter portion 30a through the opening portion 33, and is electrically connected to an outer circumferential face 30g of the small-diameter portion 30b to thereby electrically connect the substrate 5 and the outer circumferential face 30g of the metal shield member 30.
