An ultrasound sensor includes : a substrate which has at least one opening portion 18； a diaphragm 50 which is provided on the substrate so as to block the opening portion 18； a plurality of first electrodes 14 which is provided so as to be opposite to the opening portion 18 of the diaphragm 50 and to be arranged in a Y-direction, and which extends in a X-direction orthogonal to the Y-direction； a plurality of second electrodes 16 which is provided so as to be opposite to the opening portion 18 of the diaphragm 50 and to be arranged in the X-direction, and which extends in the Y-direction； and a plurality of piezoelectric layers 15 which is provided between the first electrode 14 and the second electrode 16 in at least a portion in which the first electrode 14 and the second electrode 16 intersect with each other, in which, in a Z-direction orthogonal to the X-direction and the Y-direction, a portion in which the first electrode 14, the piezoelectric layer 15 and the second electrode 16 are overlapped is referred to as an active portion, and a range to the extent that the diaphragm 50 is oscillatable by driving the active portion is referred to as a movable portion, when a unit including one movable portion and the active portion which is provided within the one movable portion is referred to as one ultrasound element in plan view, two or more types of ultrasound elements in which a dimension of the active portion with respect to a dimension of the movable portion is different from each other in plan view are provided.
