An ultrasound transducer array 40 according to an embodiment includes a substrate 41, a plurality of groove-like recesses 41A arranged at a predetermined interval on one surface of the substrate 41, a cell region 31 arranged between the recesses 41A on the one surface side of the substrate 41, a flexible film 42 configured to cover the substrate 41 and the cell region 31 and having fragility lower than fragility of the substrate 41, and a dividing groove 28 having a width smaller than a width of the recess 41A and reaching from the other surface of the substrate 41 to the flexible film 42 in the recess 41A.
