An internal resistance measuring device for a laminated battery is connected to an internal resistance measurement object including at least a laminated battery in which a plurality of power generation elements are laminated, and an AC power supply unit that outputs an alternating current to the internal resistance measurement object, and an internal resistance measurement object From the potential of the positive side AC potential difference, which is the potential difference obtained by subtracting the potential of the middle part from the potential of the part connected to the positive side load device, and the potential of the part connected to the negative side load device of the internal resistance measurement target An AC adjustment unit that adjusts the AC current so that the negative side AC potential difference, which is the potential difference obtained by subtracting the potential in the middle, matches, and the resistance of the laminated battery is calculated based on the adjusted AC current and AC potential difference A resistance calculation unit.
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