An impedance measuring device, comprising: a laminated type battery, a plurality of battery cells being laminated in the laminated type battery; a first power supply unit configured to output an alternating current of a prescribed frequency for measuring an impedance of the laminated type battery to a positive electrode terminal of the laminated type battery; a second power supply unit configured to output an alternating current of the prescribed frequency to a negative electrode terminal of the laminated type battery; a first detection unit configured to detect an alternating-current potential difference between the positive electrode terminal and an intermediate-point terminal of the laminated type battery; a second detection unit configured to detect an alternating-current potential difference between the negative electrode terminal and the intermediate-point terminal; an adjustment unit configured to adjust an amplitude of the alternating current output from at least one of the first and second power supply units (531, 532) such that the alternating-current potential difference detected by the first detection unit and the alternating-current potential difference detected by the second detection unit coincide; a computation unit configured to compute the impedance of the laminated type battery on the basis of the alternating current adjusted by the adjustment unit and the alternating-current potential difference; and a correction unit configured to correct a phase difference of the alternating currents output from the first and second power supply units (531, 532) on the basis of a phase difference between an alternating-current potential generated at the positive electrode terminal and an alternating-current potential generated at the negative electrode terminal. a laminated type battery, a plurality of battery cells being laminated in the laminated type battery; a first power supply unit configured to output an alternating current of a prescribed frequency for measuring an impedance of the laminated type battery to a positive electrode terminal of the laminated type battery; a second power supply unit configured to output an alternating current of the prescribed frequency to a negative electrode terminal of the laminated type battery; a first detection unit configured to detect an alternating-current potential difference between the positive electrode terminal and an intermediate-point terminal of the laminated type battery; a second detection unit configured to detect an alternating-current potential difference between the negative electrode terminal and the intermediate-point terminal; an adjustment unit configured to adjust an amplitude of the alternating current output from at least one of the first and second power supply units (531, 532) such that the alternating-current potential difference detected by the first detection unit and the alternating-current potential difference detected by the second detection unit coincide; a computation unit configured to compute the impedance of the laminated type battery on the basis of the alternating current adjusted by the adjustment unit and the alternating-current potential difference; and a correction unit configured to correct a phase difference of the alternating currents output from the first and second power supply units (531, 532) on the basis of a phase difference between an alternating-current potential generated at the positive electrode terminal and an alternating-current potential generated at the negative electrode terminal.