Provided is a quantitative analysis apparatus whereby a sample including a single amorphous phase can be quantitatively analyzed more conveniently. An amorphous phase quantitative analysis apparatus provided with a powder diffraction pattern acquisition means, a qualitative analysis result acquisition means, a fitting function acquisition means for acquiring a fitting function for one or a plurality of crystal phases, a total pattern fitting means executed for the powder diffraction pattern of the sample using the acquired fitting function, and a weight ratio calculation means for calculating a weight ratio of the single amorphous phase and the one or plurality of crystal phases, wherein each fitting function for the one or plurality of crystal phases is any of a first fitting function which uses an integrated intensity obtained by total pattern analysis, a second fitting function which uses an integrated intensity obtained by observation or calculation, or a third fitting function which uses a profile intensity obtained by observation or calculation, and the third fitting function is applied to the single amorphous phase.
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