Battery Pack Including Heating Member

A battery pack capable of inhibiting the occurrence of temperature deviations between battery cells in a battery cell stack includes a battery cell stack having a plurality of battery cells stacked in tight contact with each other; a heating member disposed along and in close contact with three outer surfaces of the battery cell stack; a temperature sensor connected to each of the battery cells; and a battery pack case configured to receive the battery cell stack, the heating member, and the temperature sensors. The heating member has a unitary structure including a first surface, a second surface, and a third surface.