An ultrasound sensor, including a plurality of ultrasound elements which include a first electrode, a piezoelectric layer, and a second electrode and which are arranged in a first direction and a second direction, in which at least a portion of the plurality of ultrasound elements are grouped, at least one of the first electrode and the second electrode is shared for each of the grouped ultrasound elements, bypass wiring is connected to at least one of the shared first electrode and second electrode, a following α value of the bypass wiring is greater than the α value of the first electrode or second electrode on which the bypass wiring is connected, and the electric resistance value per unit length of the bypass wiring is lower than that of the first electrode or the second electrode.α value=(Youngs modulus of Constituent Material)×(cross-sectional area of wiring or electrode).
