An ultrasonic imaging apparatus includes an image acquisition device for administering a contrast agent and acquiring B-mode image information, an image storing device for storing the B-mode image information during a predetermined imaging time range from after the administration, a first maximum intensity projection device for forming first maximum intensity projection image information using the B-mode image information acquired in a first time range contained in the imaging time range, a second maximum intensity projection device for forming second maximum intensity projection image information using the B-mode image information acquired in a second time range contained in the first time range, a second image formation device for forming a second image based on the second maximum intensity projection image information, an overlaid image generation device for generating an overlaid image in which the second image is overlaid on a first image of the first maximum intensity projection image information.
