In a battery measurement apparatus, a storage battery is caused to supply an alternating-current signal or receive an alternating-current signal to the storage battery. The alternating-current signal flowing through a first electrical path via a second electrical path is measured. In response to the alternating-current signal, a response signal of the storage battery received. Information related to a complex impedance of the storage battery is calculated based on the alternating-current signal and the response signal. A magnetic flux passage area is defined as an area surrounded by the second electrical path and through which a magnetic flux based on the alternating-current signal flowing through the first electrical path passes. A size of the magnetic flux passage area is set such that an error in the complex impedance due to induced electromotive force based on the alternating-current signal flowing through the first electrical path is within a range of ±1 mΩ.