Internal-resistance measuring device for response-delay type fuel cell

One object is to provide a measuring device configured to evaluate the power generation characteristics of a response-delay type fuel cell automatically, precisely, and with excellent reproducibility with consideration of the response delay against power load fluctuations, and effectively acclimatize and develop microorganisms that are provided to generate power. A potentio-galvanostat is connected to a microbial fuel cell provided as an exemplary response-delay type fuel cell. Further, an automatic measuring device is connected to the potentio-galvanostat. The automatic measuring device has a program function and measures the internal resistance of the microbial fuel cell at set time. The internal resistance measurement is executed through the automatic measuring device that instructs the potentio-galvanostat to change a current value flowing to the microbial fuel cell and that repeatedly executes the process of measuring and recording a voltage value of the microbial fuel cell and the current value while changing a current control value in stages after the voltage value is stabilized.