An ultrasound diagnostic apparatus includes: transmission and reception signal lines that send transmission and reception signals of ultrasound to a plurality of ultrasound transducers and signal determining portions that are close to the plurality of ultrasound transducers and determine a selection signal for selecting an ultrasound transducer to be driven or a readout signal for reading out the selection signal, the selection signal being sent out in synchronization with a transmission signal for forming the transmission and reception signal, and electrically couple the ultrasound transducer to be driven with the transmission and reception signal line in accordance with a result of the determination. The transmission and reception signal line sends the transmission and reception signal with the selection signal or the readout signal.
