PROBLEM TO BE SOLVED: To provide ultrasonic diagnostic equipment that can appropriately perform feedback control for an output voltage of a switching power source circuit even when a switching frequency of the switching power source circuit is changed.SOLUTION: A switching power source circuit 18 performs switching by a switching frequency designated in accordance with an operation state of ultrasonic diagnostic equipment 8, and outputs a power source voltage to an internal circuit group 12A. A feedback part 26 performs feedback control for an output voltage of the switching power source circuit 18. The feedback part 26 includes a digital filter as a characteristic variable circuit. Loop gain characteristics of a feedback loop that circulates around the feedback part 26, the switching power source circuit 18 and a voltage divider 20 are set by the setting of the characteristics of the digital filter. In that case, a crossover frequency in the loop gain characteristics of the feedback loop is set in accordance with the switching frequency.
