Disclosed is a divergence between a predicted power generation amount of a natural energy generation power generation facility and an actual power generation amount. A power generation amount prediction device for obtaining a predicted value of a power generation amount of a power generation facility that uses natural energy, wherein the predicted value of meteorological data in each area obtained by dividing an area around the power generation facility into a plurality of areas A map storage unit for storing a weather data map recorded in association with date / time information, a prediction target date / time receiving unit for receiving information for specifying a prediction target date / time of the power generation amount of the power generation facility, and a weather data map for the prediction target date / time A weather data average value calculation unit that calculates an average value of predicted values of weather data in an extended area composed of one or more areas including an installation area that is an area where a power generation facility is installed, and an average A power generation amount predicted value calculation unit that calculates a predicted value of the power generation amount of the power generation facility using the value and a predetermined calculation formula for calculating the power generation amount of the power generation facility from the weather data. [Selection] Figure 1
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