To provide an animal sales management system in which disease history information of a sold pet animal is systematically collected and a causal relationship between the bloodline of the pet animal and the collected disease history is easily grasped.

The animal sales management system 2 is provided with a medical treatment and disease history information receiving means for receiving medical treatment and disease history information of a sold animal commodity from an animal hospital side terminal 6 through a communication network 4, a medical treatment and disease history information database for making the received medical treatment and disease history information correspond to the sold animal commodity and storing/accumulating them, a bloodline medical treatment and disease history retrieving means for retrieving the medical treatment and disease history information of the sold animal commodity having a bloodline relation with respect to an unsold animal commodity or a particular sold animal commodity in the medical treatment and disease history information database on the basis of bloodline information, and a retrieval output means for outputting the retrieval result.