An electrode performance evaluation method, comprising: (a) mounting an electrode assembly including a first electrode, a second electrode and a separator interposed between said electrodes (11; 12), wherein at each electrode (11, 12) an active material layer (11-1; 12-2) is coated on a current collector (11-2; 12-1) between holders of an impedance measurement device, immersing the electrode assembly in an electrolyte solution and applying an alternating current signal to the electrode assembly under a plurality of frequency conditions; (b) acquiring impedance measurement data for different frequencies measured by the impedance measurement device by electrochemical impedance spectroscopy while the alternating current signal is applied to the electrode assembly from the impedance measurement device; (c) determining, from a circuit model comprising an inductor, a first resistor serially connected to the inductor, a second resistor serially connected to the first resistor, a transmission line model impedance serially connected to the second resistor and comprising a first RC circuit wherein a third resistor and a third capacitor are connected in parallel, a second RC circuit parallelly connected to the transmission line model impedance, wherein a fourth resistor and a first capacitor are connected in parallel, and a second capacitor parallelly connected to the second resistor and the transmission line model impedance, as a circuit model corresponding to the electrode assembly, an impedance equation comprising the inductance value of the inductor, the resistance values of the first to fourth resistors (401, 402, 403-1, 404-1), the capacitance values of the first and second capacitors (404-2; 405) and the time constant of the first RC circuit as fitting parameters and comprising frequency as an input parameter; (d) determining the fitting parameters comprising the resistance values of the first to third resistors (401, 402, 403-1) and the time constant of the first RC circuit such that the difference between the impedance calculation data for different frequencies calculated by changing the frequency in the impedance equation and the impedance measurement data for different frequencies is minimized; (e) calculating the resistance value of ion bulk resistance in the electrolyte solution using the ion conductivity of the electrolyte solution, the area of the electrode (11; 12) and the thickness and porosity of the active material layer (11-1; 12-2) of the electrode (11; 12); and (f) determining effective tortuosity which is a ratio of the resistance value of the third resistor to the resistance value of the ion bulk resistance. (a) mounting an electrode assembly including a first electrode, a second electrode and a separator interposed between said electrodes (11; 12), wherein at each electrode (11, 12) an active material layer (11-1; 12-2) is coated on a current collector (11-2; 12-1) between holders of an impedance measurement device, immersing the electrode assembly in an electrolyte solution and applying an alternating current signal to the electrode assembly under a plurality of frequency conditions; (b) acquiring impedance measurement data for different frequencies measured by the impedance measurement device by electrochemical impedance spectroscopy while the alternating current signal is applied to the electrode assembly from the impedance measurement device; (c) determining, from a circuit model comprising an inductor, a first resistor serially connected to the inductor, a second resistor serially connected to the first resistor, a transmission line model impedance serially connected to the second resistor and comprising a first RC circuit wherein a third resistor and a third capacitor are connected in parallel, a second RC circuit parallelly connected to the transmission line model impedance, wherein a fourth resistor and a first capacitor are connected in parallel, and a second capacitor parallelly connected to the second resistor and the transmission line model impedance, as a circuit model corresponding to the electrode assembly, an impedance equation comprising the inductance value of the inductor, the resistance values of the first to fourth resistors (401, 402, 403-1, 404-1), the capacitance values of the first and second capacitors (404-2; 405) and the time constant of the first RC circuit as fitting parameters and comprising frequency as an input parameter; (d) determining the fitting parameters comprising the resistance values of the first to third resistors (401, 402, 403-1) and the time constant of the first RC circuit such that the difference between the impedance calculation data for different frequencies calculated by changing the frequency in the impedance equation and the impedance measurement data for different frequencies is minimized; (e) calculating the resistance value of ion bulk resistance in the electrolyte solution using the ion conductivity of the electrolyte solution, the area of the electrode (11; 12) and the thickness and porosity of the active material layer (11-1; 12-2) of the electrode (11; 12); and (f) determining effective tortuosity which is a ratio of the resistance value of the third resistor to the resistance value of the ion bulk resistance.