To provide a technique that makes it possible to evaluate the characteristics of a blood coagulation factor inhibitor, the present invention provides a blood-coagulation-system analyzer that includes an estimation unit that estimates characteristics regarding an inhibitor on the basis of a comparative result between: a first result regarding the blood-coagulation inhibiting capability of said blood coagulation factor inhibitor, the first result being obtained on the basis of at least one electrical characteristic of blood to which said blood coagulation factor has been added; and a second result regarding the aforementioned blood-coagulation inhibiting capability, the second result being obtained on the basis of the at least one electrical characteristic of blood to which the blood coagulation factor has been added so as to reach a different concentration from the concentration of the blood coagulation factor in the aforementioned blood to which the blood coagulation factor has been added, or the at least one electrical characteristic of blood to which the blood coagulation factor has not been added.
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