Prediction producing apparatus, performing a database, and has a predictive equation generating means and the similarity calculation means. Performing database, in association with the manufacturing conditions and the result information of the manufacture of the manufacturing in the past, a plurality of storing a correspondence information erased by that production conditions and the result information. Degree of similarity calculation means compares the production conditions and the production conditions of the prediction is stored in the performance database penis, and calculates a similarity composed of a plurality of comparison results. Prediction creation means determines the parameters of a prediction formula corresponding to the manufacturing condition of the prediction target. Steel, heating, rolling, cooling and heat treatment, the prediction formula creation device, reverse extrapolation, interpolation station, the weighted sum of squares, the Charpy absorbed energy, the design quality, crop, tensile properties, Los Chance