PROBLEM TO BE SOLVED: To provide a purchase trend prediction device, a purchase trend prediction system, a purchase trend prediction program, and a purchase trend prediction method for accurately predicting future purchase trends for each user. A purchasing trend prediction device that predicts a user's purchasing trend based on behavior data indicating the user's behavior by an information terminal via a network. The purchase trend prediction device uses behavior data indicating the user's behavior by the information terminal via the network as input of the prediction model within a specified period, and purchases showing the future purchase trend of the user corresponding to the input behavior data. It has a forecast processing means for generating trend data. The prediction model is generated by machine learning based on the behavior data of a plurality of users in the past. [Selection diagram] Fig. 1
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