Disclosed herein is a voltage detecting device including: an analog converting circuit configured to level-convert voltages of a plurality of battery cells constituting a battery into low voltages; a digital converting circuit configured to convert the low voltages output by the analog converting circuit into digital values; and a control circuit configured to be driven by a power supply provided separately to control the digital converting circuit; the analog converting circuit being driven by a first power generated from the plurality of battery cells, and the digital converting circuit being driven by a second power generated on a basis of a pulse signal generated by the control circuit.