The present invention is designed such that, even when inward currents cannot be calculated properly, it is possible to generate current waveforms that can appropriately evaluate the action of a target body tissue by calculating currents that are equivalent to inward currents. A biomagnetic field measurement system includes circuitry and a memory storing executable instructions which, when executed by the circuitry, cause the circuitry to: based on current components extracted from current signals calculated from a biomagnetic field signal, add up current waveforms of current components along a conduction pathway of an action current in a body tissue that is targeted for evaluation, and generate a current waveform for evaluating an intra-cellular current flowing in the conduction pathway, locations of the current components of the added current waveforms being predetermined set distances apart on the conduction pathway, in front of and behind a location of interest on the conduction pathway.