To inhibit the air surrounding an animal breeding apparatus from invading into an animal receiving and growing vessel and prevent the polluted air in the animal-receiving and growing vessel from leaking out to the surrounding of the breeding apparatus while saving the necessary amount of exhaust air.

The clean air As is blown out of an outlet 10 for air curtain blowing to form the air curtain S for shielding a front face gap space X between the upper opening 4a of an animal-receiving and growing vessel 4 and the ceilings 2, 1a of a vessel receiving part 3. In the meantime, the front face is shielded with a shielding material 7 and the air curtain for shielding at least the front side parts of left and right sides of the front face of the gap space X, thereby only rear part of the gap space is opened as the air-flowing route opened to the inside of the vessel receiving part. Further, the apparatus is equipped with an air-blowing outlet 9 for ventilation to blow clean ventilation air Ar from the upper side into the inside of the animal-receiving and growing vessel 4 included in the vessel receiving part 3 and an exhaustion outlet 12 for sucking out the air E in the vessel receiving part 3.