Provided are a novel platelet aggregation activity measurement device and a novel platelet aggregation activity measurement method, which can be used for monitoring in an anti-platelet therapy. A platelet aggregation activity analysis device equipped with: a blood coagulation system analysis section for analyzing platelet aggregation activity on the basis of measurement data for a coagulation process of a platelet-containing sample to which a platelet-inducing substance has been added; and an output control section for controlling the output of an analysis result produced by the blood coagulation system analysis section.
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