A learning device estimating apparatus aims at a learning device as an attack target, and comprises a recording part, an inquiring part, a capturing part and a learning part. A predetermined plurality of pieces of observation data are recorded. The inquiring part inquires of the attack target learning device for each of the pieces of observation data recorded in the recording part to acquire label data and records the acquired label data to the recording part in association with observation data. The capturing part inputs the observation data and the label data associated with the observation data that have been recorded to the recording part, to the learning part. The learning part is characterized by using an activation function that outputs a predetermined ambiguous value in a process for determining a classification prediction result, and the learning part performs learning using the inputted observation data and label data.
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