The animal type determination device configured to perform pattern recognition with respect to an image obtained by image-capturing a periphery of a vehicle using a plurality of pre-stored animal image patterns, and to determine the type of an animal in the image is provided. The animal type determination device is configured to recognize the type of a caution target animal indicated by an animal warning sign in the image captured by a camera, raise a determination priority of the animal image pattern corresponding to the type of the caution target animal in a case where the type of the caution target animal is recognized, and performs the pattern recognition of the animal image pattern in the order of the determination priority to determine the type of the animal in the image.