An ultrasound imaging apparatus capable of easily displaying a three-dimensional image included in a region of interest (ROI). A display controller causes a display to display a tomographic image, and further causes the display to display a first marker indicating a three-dimensional scan range and a second marker indicating a range to generate three-dimensional image data, a range subjected to rendering, to be superimposed on a tomographic image. The second marker is rotatable on the tomographic image in accordance with an instruction by an operator. A transceiver causes an ultrasound probe to scan the three-dimensional scan range specified based on the first marker. An image processor executes rendering on, of data acquired in the scan, data included in the range specified based on the second marker, thereby generating three-dimensional image data.
