This lead-acid storage battery monitoring device is provided with: a plurality of monitoring units 20 which are attached to a plurality of lead-acid storage batteries 1 connected in series and/or in parallel and measure monitoring data; and a management unit 10 connected to the plurality of monitoring units 20 for sequential wireless communication. The lead-acid storage battery monitoring device performs: a first monitoring operation in which the management unit 10 receives, sequentially from the plurality of monitoring units 20, the monitoring data including the internal resistance and temperature of each of the lead-acid storage batteries 1; and a second monitoring operation in which the management unit 10 receives, sequentially from the plurality of monitoring units 20, the monitoring data including the temperature of each of the lead-acid storage batteries 1.
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