A determination device (100) is provided with: an imaging unit (41) that images an object (10) having undergone sealing processing using an adhesive (27) and acquires the distribution of intensity of energy radiated from the adhesive (27); and a determination unit (43) that calculates a temporal change in intensity of the energy radiated from the adhesive (27) on the basis of a first distribution representing a distribution acquired by imaging performed by the imaging unit (41) at a first time point and a second distribution representing a distribution acquired by imaging performed by the imaging unit (41) at a second time point later than the first time point, and that determines the quality of sealing in accordance with the calculated temporal change.
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