A temperature regulator efficiently regulates a temperature of a storage battery. The regulator includes a thermoelectric transducer having a first face and a second face. The first face is thermally coupled with one or plural storage batteries, and the second face is thermally coupled with a thermal action accelerating medium that accelerates thermal action on the second face. The first face and the second face do two jobs contradictory to each other, i.e., heat dissipation and heat absorption, responsive to a polarity in exciting the battery. This structure allows the temperature regulator to cool down and warm up the storage battery.