1. An image trimming apparatus, comprising: a reading device which reads out an original image to be trimmed from an original recording device in which the original image is recorded; a displaying device which displays an image based on the read out original image; a manual trimming indicating device which indicates a trimming region by a manual operation with respect to the image displayed on the displaying device; an automatic trimming indicating device which, when the read out original image includes a face image of a person, automatically indicates a predetermined trimming region having the face image at the time of the manual operation; and a trimming device which cuts out the image within the trimming region indicated by the manual trimming indicating device or the automatic trimming indicating device from the original image of the image displayed on the displaying device, wherein, when indicating a size of a photograph of an upper body of an object person as the predetermined trimming region, the automatic trimming indicating device automatically indicates the predetermined trimming region by making the center of the predetermined trimming region the center of the face image, if the vertical length of the predetermined trimming region is twice or larger than the vertical length of the face image and β≧py-δ is satisfied where the vertical length of the predetermined trimming region is β, the vertical length of the original image is py, and margin is δ.