An ultrasound unit 30 includes an ultrasound array 40 that has a plurality of ultrasound elements 20, each of which has a first principal surface that is rectangular where a transmitting and receiving portion 60, a signal electrode terminal 52, and a ground electrode terminal 51 are arranged in a longer side direction, longer sides of the ultrasound elements 20 being coupled, one or more short-lines 41 that are connected to a plurality of ground electrode terminals 51, a ground line 43 that is connected to the short-line 41, and a plurality of signal lines 42, each of which is connected to one of the signal electrode terminals 52, and adjoining ultrasound elements of the ultrasound elements 20 are coupled such that the signal electrode terminals 52 are arranged alternately on opposite sides in the longer side direction of the transmitting and receiving portions 60 that are rectangular.
