Abstract: A conversion device converts output information, which is output from a device having a predetermined gas detection function with respect to a predetermined odor molecule, into quantified data of an odorant receptor. The conversion device comprises a conversion unit that uses a prediction model, which has been subjected to machine learning using, as explanatory variables, pieces of output information output from a device having a plurality of gas detection functions with respect to a plurality of respective odor molecules and using, as objective variables, pieces of response information indicating a plurality of responses of the odorant receptor with respect to the plurality of respective odor molecules, to convert the acquired output information into response information indicating a response of the odorant receptor.