Management device and environment control method in repository

A method for controlling the environment in a storage tank comprises a monitoring step for monitoring an object (16) to be monitored in a state in which the stored object (15) and the object (16) to be monitored are stored in the storage tank (S), and a control step for controlling the object (16) to be monitored in a state in which the object (16) to be monitored is monitored in a state in which the stored object (15) and the object (16) to be monitored are stored in the storage tank (S). And an environment control unit that controls the environment in the repository (S) on the basis of the monitoring results of the objects (16) to be monitored, the objects (16) to be monitored being damaged earlier than the stored objects (15) due to the environment. 储存库内的环境控制方法包括监控工序和控制工序，在所述监控工序中，在所述储存库内(S)储存有所述储存物(15)和监控对象物(16)的状态下，对所述监控对象物(16)进行监控，在所述控制工序中，根据对所述监控对象物(16)的监控结果对所述储存库内(S)的环境进行控制，所述监控对象物(16)比所述储存物(15)更早地发生因所述环境而引起的损伤。