An ultrasound unit comprising: an ultrasound array that has a plurality of ultrasound elements, in each of which a transmitting and receiving portion, a signal electrode terminal, and a ground electrode terminal are disposed, longer sides of the plurality of ultrasound elements being coupled; one or more short-lines that are connected to a plurality of the ground electrode terminals; one or more ground lines, each of which is connected to one of the short-lines; and a plurality of signal lines, each of which is connected to one of the signal electrode terminals, wherein each of the transmitting and receiving portions has a signal electrode for transmitting and receiving ultrasound and a ground electrode, the signal electrode is connected to the signal electrode terminal, and the ground electrode is connected to the ground electrode terminal, adjoining ultrasound elements of the ultrasound elements are coupled such that the signal electrode terminals are arranged alternately on opposite sides in a longer side direction of the transmitting and receiving portions that are rectangular, the plurality of ground electrode terminals connected to one of the short-lines are laid out in a straight line shape, the plurality of ultrasound elements bend in a convex shape or a radial shape in a coupling direction, in each of the ultrasound elements, the transmitting and receiving portion, the signal electrode terminal, and the ground electrode terminal are disposed at a first principal surface of the ultrasound element, the plurality of ultrasound elements are coupled such that shorter sides are positioned in a zigzag manner at either end face of the ultrasound array to form a plurality of notch portions, and each of the signal lines is provided to extend to a second principal surface side via a notch portion. an ultrasound array that has a plurality of ultrasound elements, in each of which a transmitting and receiving portion, a signal electrode terminal, and a ground electrode terminal are disposed, longer sides of the plurality of ultrasound elements being coupled; one or more short-lines that are connected to a plurality of the ground electrode terminals; one or more ground lines, each of which is connected to one of the short-lines; and a plurality of signal lines, each of which is connected to one of the signal electrode terminals, wherein each of the transmitting and receiving portions has a signal electrode for transmitting and receiving ultrasound and a ground electrode, the signal electrode is connected to the signal electrode terminal, and the ground electrode is connected to the ground electrode terminal, adjoining ultrasound elements of the ultrasound elements are coupled such that the signal electrode terminals are arranged alternately on opposite sides in a longer side direction of the transmitting and receiving portions that are rectangular, the plurality of ground electrode terminals connected to one of the short-lines are laid out in a straight line shape, the plurality of ultrasound elements bend in a convex shape or a radial shape in a coupling direction, in each of the ultrasound elements, the transmitting and receiving portion, the signal electrode terminal, and the ground electrode terminal are disposed at a first principal surface of the ultrasound element, the plurality of ultrasound elements are coupled such that shorter sides are positioned in a zigzag manner at either end face of the ultrasound array to form a plurality of notch portions, and each of the signal lines is provided to extend to a second principal surface side via a notch portion.