An ultrasound probe comprises a transducer array composed of a plurality of arrayed subdice elements, a plurality of signal lines for connecting the transducer array to an apparatus body that controls transmission and reception of ultrasonic waves, and a channel forming/connecting section that selects a connection between the plurality of subdice elements to form a plurality of channels each composed of a selected number of subdice elements which is changed by switching connections between a plurality of subdice elements, and assigns the plurality of channels to any of the plurality of signal lines to select, from among the plurality of signal lines, effective signal lines connected to the plurality of channels to transmit driving signals supplied to the transducer array and reception signals outputted from the transducer array to the apparatus body.
