An ultrasonic imaging apparatus includes a 3D tomographic image data capturing device which captures 3D tomographic image data from a 3D region inside a subject, a region-of-interest setting device which sets a 3D region of interest corresponding to the 3D region in an image memory, a surface image extracting device which extracts data on a surface image, in the 3D region of interest, of a massive tissue included in the 3D region, a stereoscopic display generating device which generates stereoscopic display data, and a display device which displays the stereoscopic display data. The region-of-interest setting device displays a 2D tomographic image of a 2D region including the massive tissue on the display device, allows setting of a marker indicating a periphery of the massive tissue in the 2D tomographic image, and generates the 3D region of interest according to data on the markers position.
