An ultrasound transducer comprising: an acoustic matching layer bent with a predetermined curvature; a plurality of piezoelectric elements disposed on an inner face on a side of a curvature center of the acoustic matching layer in a state where the plurality of piezoelectric elements are bent; a plurality of wirings including respective one ends electrically connected to the plurality of piezoelectric elements, respectively; a substrate to which respective another ends of the plurality of wirings are electrically connected; and a holding member provided in a space between the plurality of piezoelectric elements and the substrate, and provided on the plurality of wirings at a position partway of the plurality of wirings connecting the plurality of piezoelectric elements and the substrate, the holding member being configured to hold a pitch of the plurality of wirings so as to be a pitch that is smaller than a predetermined arrangement pitch of the plurality of piezoelectric elements, characterized in that the substrate includes a first substrate, and a second substrate provided so as to be continuous with a back face of the first substrate and so as to include a potential that is a same as a potential of the first substrate, the plurality of wirings include a plurality of first wirings including respective another ends electrically connected to the first substrate, and a plurality of second wirings including respective another ends electrically connected to the second substrate, and the holding member includes a first holding member configured to hold the plurality of first wirings and a second holding member configured to hold the plurality of second wirings, the first holding member and the second holding member hold the plurality of first wirings and the plurality of second wirings in a staggered manner so that the plurality of first wirings and the plurality of second wirings are shifted from each other by 1/2 of the pitch and are directed in respective directions away from each other. an acoustic matching layer bent with a predetermined curvature; a plurality of piezoelectric elements disposed on an inner face on a side of a curvature center of the acoustic matching layer in a state where the plurality of piezoelectric elements are bent; a plurality of wirings including respective one ends electrically connected to the plurality of piezoelectric elements, respectively; a substrate to which respective another ends of the plurality of wirings are electrically connected; and a holding member provided in a space between the plurality of piezoelectric elements and the substrate, and provided on the plurality of wirings at a position partway of the plurality of wirings connecting the plurality of piezoelectric elements and the substrate, the holding member being configured to hold a pitch of the plurality of wirings so as to be a pitch that is smaller than a predetermined arrangement pitch of the plurality of piezoelectric elements, characterized in that the substrate includes a first substrate, and a second substrate provided so as to be continuous with a back face of the first substrate and so as to include a potential that is a same as a potential of the first substrate, the plurality of wirings include a plurality of first wirings including respective another ends electrically connected to the first substrate, and a plurality of second wirings including respective another ends electrically connected to the second substrate, and the holding member includes a first holding member configured to hold the plurality of first wirings and a second holding member configured to hold the plurality of second wirings, the first holding member and the second holding member hold the plurality of first wirings and the plurality of second wirings in a staggered manner so that the plurality of first wirings and the plurality of second wirings are shifted from each other by 1/2 of the pitch and are directed in respective directions away from each other.