An image processing device generates a high-resolution image from a plurality of low-resolution images, in which the high-resolution image has a resolution higher than a resolution of the low-resolution images. The image processing device includes a reference image setting portion for selecting a reference image from the plurality of low-resolution images based on image information of the plurality of low-resolution images. The image processing device generates the high-resolution image by performing a resolution increasing process on the plurality of low-resolution images for increasing a resolution with respect to the reference image.