An ultrasound probe comprising: a substantially rectangular-shaped ultrasound transducer printed circuit board having a distal end portion formed in a projecting arcuate shape, and provided with a first electrode group, a second electrode group, and a first signal pattern group; a plurality of ultrasound transducers arranged in the arcuate shape in the distal end portion of the ultrasound transducer printed circuit board; and a signal pattern direction changing printed circuit board provided with a second signal pattern group and a third electrode group, wherein the signal pattern direction changing printed circuit board is completely overlapping an area of the ultrasound transducer printed circuit board; the first electrode group is constituted by a plurality of first electrode sections provided in the arcuate shape in the distal end portion of the ultrasound transducer printed circuit board, each of the first electrode sections facing and being connected to each of the plurality of ultrasound transducers; the second electrode group is constituted by a plurality of second electrode sections arranged in a longitudinal axis direction of the ultrasound transducer printed circuit board; the first signal pattern group is constituted by a plurality of first signal patterns adapted to connect between the second electrode sections and a part of the first electrode sections, wherein the first signal pattern group extends from the part of the first electrode sections towards a proximal end side of the ultrasound transducer printed circuit board, then bends in an angle direction different from the longitudinal axis direction, and further extends toward each electrode section of the second electrode group; the third electrode group is constituted by a plurality of third electrode sections arranged on a proximal end portion side of the signal pattern direction changing printed circuit board in a short axis direction of the signal pattern direction changing printed circuit board; and the second signal pattern group is constituted by a plurality of second signal patterns adapted to connect between the second electrode sections and the third electrode sections and has one end connectable to each electrode section of the second electrode sections, extends from the one end in an angle direction different from the longitudinal axis direction, then bends in an angle direction different from the extending direction, and further extends in the longitudinal axis direction toward the proximal end portion. a substantially rectangular-shaped ultrasound transducer printed circuit board having a distal end portion formed in a projecting arcuate shape, and provided with a first electrode group, a second electrode group, and a first signal pattern group; a plurality of ultrasound transducers arranged in the arcuate shape in the distal end portion of the ultrasound transducer printed circuit board; and a signal pattern direction changing printed circuit board provided with a second signal pattern group and a third electrode group, wherein the signal pattern direction changing printed circuit board is completely overlapping an area of the ultrasound transducer printed circuit board; the first electrode group is constituted by a plurality of first electrode sections provided in the arcuate shape in the distal end portion of the ultrasound transducer printed circuit board, each of the first electrode sections facing and being connected to each of the plurality of ultrasound transducers; the second electrode group is constituted by a plurality of second electrode sections arranged in a longitudinal axis direction of the ultrasound transducer printed circuit board; the first signal pattern group is constituted by a plurality of first signal patterns adapted to connect between the second electrode sections and a part of the first electrode sections, wherein the first signal pattern group extends from the part of the first electrode sections towards a proximal end side of the ultrasound transducer printed circuit board, then bends in an angle direction different from the longitudinal axis direction, and further extends toward each electrode section of the second electrode group; the third electrode group is constituted by a plurality of third electrode sections arranged on a proximal end portion side of the signal pattern direction changing printed circuit board in a short axis direction of the signal pattern direction changing printed circuit board; and the second signal pattern group is constituted by a plurality of second signal patterns adapted to connect between the second electrode sections and the third electrode sections and has one end connectable to each electrode section of the second electrode sections, extends from the one end in an angle direction different from the longitudinal axis direction, then bends in an angle direction different from the extending direction, and further extends in the longitudinal axis direction toward the proximal end portion.