A fatty acid composition ratio of fat in a living body can be measured. The measurement system includes: (A) a nuclear magnetic resonance sensor including a magnetic circuit and a high-frequency coil; (B) a proton lateral relaxation waveform for a living animal from the high-frequency coil by outputting a predetermined high-frequency pulse to the high-frequency coil, Calculates a lateral relaxation time for fat included in a predetermined model formula by regression analysis to the proton lateral relaxation waveform data, and calculates an amount ratio of unsaturated fatty acid of a living animal on the basis of the calculated lateral relaxation time for fat and data of a calibration curve prepared in advance. Fig. 10

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