A camera position posture evaluating device comprising: a resolution evaluating means (211,215,71) which evaluates the resolution of a target object in an image obtained by capturing the image of the target object arranged at any position in a target area, and thereby derives a first suitability rate for each position in the target area by applying a resolution evaluation function with the resolution, wherein the resolution evaluation function defines a relationship between the resolution and the first suitability rate, and a gazing point angle evaluating means (212, 216, 72) which evaluates a gazing point angle which is an angle formed between a straight line which passes through a gazing point in the target object arranged at any position in the target area and the position of the camera, and a ground, and thereby derives a second suitability rate for each position in the target area by applying a gazing point angle evaluation function with the gazing point angle, wherein the gazing point angle evaluation function defines a relationship between the gazing point angle and a second suitability rate, and a target area evaluating means (213, 217, 73) which derives a third suitability rate, which is determined based on to what degree a target object field-of-view area, which is determined by a collection of determined positions, which are positions on the ground in real space, which correspond to positions of pixels in the image, and in which the entirety of the target object fits in the image when the target object is arranged at any of the determined positions, and the target area overlap, and a comprehensive evaluating means (214,74) which, based on the first suitability rate for each position in the target area, the second suitability rate for each position in the target area, and the third suitability rate, derives an evaluation index which indicates to what degree a posture of the camera is suitable to an image processing, and the closer the evaluation index is to 0, the more suitable the posture of the camera is for the image processing. a resolution evaluating means (211,215,71) which evaluates the resolution of a target object in an image obtained by capturing the image of the target object arranged at any position in a target area, and thereby derives a first suitability rate for each position in the target area by applying a resolution evaluation function with the resolution, wherein the resolution evaluation function defines a relationship between the resolution and the first suitability rate, and a gazing point angle evaluating means (212, 216, 72) which evaluates a gazing point angle which is an angle formed between a straight line which passes through a gazing point in the target object arranged at any position in the target area and the position of the camera, and a ground, and thereby derives a second suitability rate for each position in the target area by applying a gazing point angle evaluation function with the gazing point angle, wherein the gazing point angle evaluation function defines a relationship between the gazing point angle and a second suitability rate, and a target area evaluating means (213, 217, 73) which derives a third suitability rate, which is determined based on to what degree a target object field-of-view area, which is determined by a collection of determined positions, which are positions on the ground in real space, which correspond to positions of pixels in the image, and in which the entirety of the target object fits in the image when the target object is arranged at any of the determined positions, and the target area overlap, and a comprehensive evaluating means (214,74) which, based on the first suitability rate for each position in the target area, the second suitability rate for each position in the target area, and the third suitability rate, derives an evaluation index which indicates to what degree a posture of the camera is suitable to an image processing, and the closer the evaluation index is to 0, the more suitable the posture of the camera is for the image processing.