The present invention provides an image assessment device capable of accurately and promptly assessing an image pair used for 3D measurement from plural captured images. An image assessment device according to the invention includes first captured image selection device, first captured image information acquisition device, object distance to-be-measured acquisition device, object position to-be-measured calculation device, second captured image selection device, second captured image information acquisition device, imaging range calculation device, and assessment device that determines whether or not a calculated object position to be measured is within a calculated imaging range, and assesses that a first captured image and a second captured image are of an image pair if determining that the calculated object position to be measured is within the calculated imaging range.