1. A device for measuring strategy acquisition comprising a measuring portion that measures a blood amount or/and a blood component amount in a predetermined measuring region of brains of a subject, a time change data producing portion that obtains the blood amount or/and the blood component amount measured by the above-mentioned measuring portion chronologically and that produces time change data as data showing time change of the blood amount or/and the blood component amount, and an output portion that outputs the time change data produced by the time change data producing portion in case the subject conducts a predetermined work so that timing when the subject acquires strategy to solve the work can be detectable.