An ultrasound transducer includes: piezoelectric elements； a substrate configured to perform input and output of an electric signal with respect to each of the piezoelectric elements； signal input and output electrodes where each signal input and output electrode is provided between each piezoelectric element and the substrate； first backing materials where each first backing material is provided at each of the piezoelectric elements on a side where the signal input and output electrode is arranged； sealing portions where each sealing portion is configured to seal an outer surface of at least a portion of an electrical path connecting the substrate with the signal input and output electrode； a wall configured to surround oscillating portions including the piezoelectric element, the first backing material, the signal input and output electrode, and the sealing portion； and a second backing material provided in a hollow space formed by the wall and the oscillating portions.
