The present invention is intended to reduce the consumption of a battery while appropriately performing operation in the case where an AC power source is disconnected and power supply is switched to the battery. An ultrasonic diagnostic apparatus including: an AC adapter connection detecting section (13) that detects whether the ultrasonic diagnostic apparatus is electrically connected with the AC power source; and a display section (10), wherein, when the AC adapter connection detecting section (13) detects that the AC power source is disconnected, power supply is switched to power supply from the battery (11), and an operation screen for controlling an amount of the power supply in the ultrasonic diagnostic apparatus is displayed on the display section (10).