To provide a prediction device and a prediction method for realizing premature birth outbreak prediction from an intraoral bacterial flora.SOLUTION: One aspect of the present invention relates to a prediction device comprising a data acquisition function for acquiring bacterial flora data pertaining to the intraoral bacterial flora of a pregnant woman, a premature birth prediction model generation function for generating a premature birth prediction model on the basis of the bacterial flora data, a premature birth prediction function for executing premature birth outbreak prediction of the pregnant woman from the acquired bacterial flora on the basis of the premature birth prediction model, and a result notification function for notifying of the result of premature birth outbreak prediction, the data acquisition function acquiring the bacterial flora data at multiple points of time in a data acquisition period from either before or after the pregnancy of the pregnant woman to either before or after childbirth, the premature birth prediction function executing premature birth outbreak prediction on the basis of the bacterial flora data acquired at the multiple points of time.SELECTED DRAWING: Figure 3
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