An image processing device is described herein including an information input unit that receives as an input three-dimensional structure information indicating a three-dimensional structure of a heart； and an image generation unit that develops an inner wall of atria and ventricles of a heart indicated by the three-dimensional structure information into a two-dimensional image based on an equal-area projection, and generates a developed image interrupted by dividing the two-dimensional image into a front wall, a rear wall, a left wall, and a right wall.
