1. A person image retrieval apparatus which retrieves an image in which the same person shown in a retrieval target image is shown, from a group of search target images, the person image retrieval apparatus comprising: a comparison target setting section which sets face parts to be compared; a comparison/determination section which compares a face of the person shown in the retrieval target image and the face of the person shown in each image of the group of search target images by the face parts set by the comparison target setting section and determines an image with a particular correlation to be a similar image; an output section which outputs the image determined by the comparison/determination section to be a similar image on a display device; a re-retrieval instruction section which instructs a re-retrieval; and a device where a re-retrievable number is set in advance, and when the re-retrieval is instructed by the re-retrieval instruction section over the re-retrievable number, and error display is outputted on the display device, wherein the comparison target setting section adds and sets a face part to be compared each time when the re-retrieval is instructed by the re-retrieval instruction section.