1. An image evaluation apparatus comprising: a storage portion which stores a plurality of images when a photographing area of a camera has continuously imaged in a predetermined time interval a plurality of frames of a subject in the photographing area of the camera, and an image evaluation portion which evaluates a plurality of the images stored in the storage portion, based on a characteristic amount showing a state in which the subject in the photographing area changing in chronological sequence, when the plurality of the images is imaged, wherein: the image evaluation portion, from a plurality of the images stored in the storage portion, calculates as the characteristic amount a frequency distribution of motion vector arising between frames of each segmented region when each image is segmented into a plurality of segmented regions, and also carries out the evaluation based on similarity between the frequency distribution of first motion vectors in a region including a center area of the image, and a model frequency distribution of the motion vectors set beforehand as an evaluation standard of a preferable image in the region including the center area of the image, the region including the center area of the image being a part of the image and not including an entire image, and the image evaluation portion calculates as the characteristic amount the frequency distribution of the motion vectors for a region in the vicinity of the center of the image, which has similarity of a color to a region and is not background, and which has continuity of the color with that region.