PROBLEM TO BE SOLVED: To easily manage radioactive waste in a storage device and a monitoring device for radioactive waste and a method for managing radioactive waste. SOLUTION: A first storage container 21 for storing radioactive waste, a state detector 22 provided in the first storage container 21 for detecting an internal state, and at least one first storage container 21 are stored. A second storage container 23 and a communication device 24 provided in the second storage container 23 for transmitting the detection result of the state detector 22 to the outside of the second storage container 23 are provided. [Selection diagram] Fig. 1
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