An ultrasonic image processing device includes an image acquisition unit that acquires a plurality of internal tomographic images of a target object in a plane including a first direction, along a second direction intersecting the first direction, an image dividing unit that divides each of the internal tomographic images into a plurality of separate images with a normal line to the first direction, and acquires the separate images, and an image combining unit that extracts separate images corresponding to coordinates on a continuous line which is continued in a plane including the first direction and the second direction, from the plurality of separate images, and arranges and combines the separate images in order of coordinates along the continuous line so as to generate a combined tomographic image.
