Effectively estimate the learner for classification. The learning device estimation device of the present invention targets a learning device for a classification task that outputs the type of input observation data as label data, and includes a recording unit, an inquiry unit, an import unit, and a learning unit. The recording unit records a plurality of predetermined observation data. The inquiry unit makes an inquiry to the learning device of the attack target for each observation data recorded in the recording unit, acquires label data, and records the label data acquired in association with the observation data in the recording unit. The import unit inputs the observation data recorded in the recording unit and the label data associated with the observation data into the learning unit. The learning unit is characterized by using an activation function that outputs a predetermined ambiguous value in the process of obtaining the classification prediction result, and learns using the input observation data and label data.
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