Appropriate work assignment is achieved taking into account the mental and physical condition of a worker. A work assignment device includes: a biometric information acquisition unit for acquiring biometric information about the living body of a worker, a production information acquisition unit for acquiring production information of a work record of a worker, a time series data generation unit for generating time series data that each worker the biometric Information and the production information, a mental / physical condition estimating unit for estimating the mental and physical condition of a worker based on the time series data, and a work assignment unit for assigning work to a worker based on the estimated mental and physical condition of the worker .
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