An ultrasound diagnostic apparatus, including: an ultrasound diagnostic apparatus main body which transmits a drive signal to an ultrasound probe that transmits and receives ultrasound waves, and which generates an ultrasound image based on a received signal that is obtained from the ultrasound probe； and a battery unit which is externally attached to the ultrasound diagnostic apparatus main body and supplies electric power to the ultrasound diagnostic apparatus main body, wherein the battery unit includes: a battery housing which is made of resin and contains a battery therein； an electrical connector for connection to the ultrasound diagnostic apparatus main body, the electrical connector being fixed to the battery housing； and a conductive member which is arranged between the battery and an inner wall of the battery housing, and the conductive member is grounded to the ultrasound diagnostic apparatus main body.
