Provided is an ultrasound diagnostic apparatus capable of synchronizing emission of light from a light source device emitting light for generating a photoacoustic wave and reception in an ultrasound probe with high accuracy. The ultrasound diagnostic apparatus includes a sub-controller (12) that has a synchronization signal generation unit (12a) and controls an ultrasound probe (20) based on a first synchronization signal generated by the synchronization signal generation unit (12a), an image generation unit (11a) that generates an ultrasound image based on a signal detected by the ultrasound probe (20), and a connector (17) that has a synchronization signal line for transmitting a second synchronization signal generated in the synchronization signal generation unit (12a) and outputs the second synchronization signal to the outside through the synchronization signal line. The connector (17) is configured such that a photoacoustic wave light source unit (60) emitting light incident on a puncture needle (61) having a photoacoustic wave generation unit is connectable.
