This determination device comprises: an irradiation unit (10) for irradiating an object (A) including a food or a plant with light; an extraction unit (20) for extracting predetermined fluorescence having a predetermined wavelength within the fluorescence emitted from the surface of the object (A) when irradiated with light; an imaging unit (30) that captures a fluorescence image expressing the predetermined fluorescence; and a determination unit (60) that determines the state of the object (A) on the basis of an index indicating the fluorescence intensity of the fluorescence image.

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