1. An image searching device comprising: a component for inputting shape information on a printable area; a component for setting an image search condition; and a component for searching a print target image from a plurality of images on the basis of the shape information on the printable area, and the image search condition, wherein the component for searching a print target image is configured to detect a main subject included in the image, and output as the print target image an image that includes the main subject fitting into the printable area and covers all of the printable area.