An ultrasonic diagnosis device and its operation method enable accurate measurement of an abdomen circumference of a test subject. The device has: a probe part (101) to transmit/receive an ultrasonic wave； an image processing unit (108) to generate a tomographic image of a tissue in the test subject based on a signal obtained from the probe part； an abdomen circumference measurement unit (109) to generate plural ellipses corresponding to an abdomen of the test subject from the tomographic image and measure an abdomen circumference； and an output unit (110) to display a measurement result from the abdomen circumference measurement unit (109). The plural ellipses are displayed with respect to the extracted abdomen on the tomographic image, and the circumference of the abdomen is measured.
