PROBLEM TO BE SOLVED: To provide a mold growth amount calculation device and a mold growth amount calculation method capable of calculating a prediction growth amount of molds, according to a state similar to a real state.SOLUTION: A mold growth amount calculation device comprises: an environmental information acquisition part 31 for acquiring environmental information of an object space; a prediction growth amount calculation part 32 for calculating a prediction growth amount of molds generated on a member, based on the environmental information acquired by the environmental information acquisition part 31, and cleaning degree of the member disposed in the object space; and a warning notification part 33 for, when the prediction growth amount calculated by the prediction growth amount calculation part 32 exceeds a threshold, notifying of a warning.SELECTED DRAWING: Figure 1
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