The present invention relates to a multi-stage type chamber for a chronic inhalation toxicity test. The multi-stage type chamber for a chronic inhalation toxicity test according to the present invention includes: cages where experimental animals are bred a cage shelf having wheels and configured in a step structure by L-shape frames which are slantingly stacked to receive the cages in a step structure to maintain the same experiment condition a laboratory having an inner space shielded by an openable observation door, in which the cage shelf is installed in the inner space, experimental materials are introduced into the inner space from the top through a feeding port under the control of a controller and discharged downward from the inner space through an exhaust port and a water feeding device connected to each cage of the cage shelf installed in the inner space of the laboratory to supply water to the experimental animals accommodated in the cages. An air stream port having a conical shape is installed at a ceiling of the laboratory. When air is fed, the air stream is expanded to allow the air stream to be smoothly moved to the cages placed on the cage shelf in the form of a step. According to the present invention, the cages for breeding the experimental animals are placed in the cage shelf in the form of a stair in the inner space of the laboratory, so the breeding area for the experimental animals can be increased. Since the experimental materials are fed from the top to the bottom, the chronic experiment for testing the aging of the experimental materials may be stably performed under the same experimental condition of the cages (amount of ventilation, air stream, temperature, humidity, noise and lighting) while reducing the factors causing the stress to the experimental animals.본 발명은 다단형 만성흡입독성 실험챔버에 관한 것이다.본 발명의 다단형 만성흡입독성 실험챔버는 실험동물들이 사육되는 케이지들 상기 케이지들이 균일한 실험조건을 유지하도록 계단식으로 수납 가능하게 ㄴ자 형태의 프레임들이 경사지게 적층되어 계단 형태를 이루며 바퀴들을 갖는 케이지선반 상기 케이지선반이 안치되는 내부공간을 개폐가능한
