An ultrasound transducer includes: an acoustic matching layer bending 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 such a manner that the plurality of piezoelectric elements bend; a plurality of wirings including respective one ends electrically connected to the plurality of piezoelectric elements, respectively; a substrate to which respective other ends of the plurality of wirings are electrically connected; and a holding member provided on the plurality of wirings at a position partway of the plurality of wirings between 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 equal to or smaller than a predetermined arrangement pitch of the plurality of piezoelectric elements.