Provided is a quantitative analysis device that enables quantitative analysis of a sample containing one amorphous phase to be performed in a simpler manner. An amorphous phase quantitative analysis device includes: powder diffraction pattern acquisition means; qualitative analysis result acquisition means; fitting function acquisition means for acquiring a fitting function for each of one or more crystal phases ; whole-powder pattern fitting means for executing whole-powder pattern fitting for a powder diffraction pattern of a sample by using the acquired fitting function; and weight ratio calculation means for calculating a weight ratio of the one amorphous phase and the one or more crystal phases. The fitting function for each of the one or more crystal phases is any one of a first fitting function that uses an integral intensity obtained by whole-powder pattern decomposition, a second fitting function that uses an integral intensity obtained by observation or calculation, and a third fitting function that uses a profile intensity obtained by observation or calculation, and the third fitting function is applied to the one amorphous phase.
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