A battery pack including a cell block including a group of battery cells electrically connected to each other; and a detector on a lateral surface of the cell block, the detector including an insulative body, a voltage detection lead, and a temperature detection lead, wherein the insulative body faces an outer peripheral surface of a first battery cell, the outer peripheral surface being exposed at the lateral surface of the cell block, and the voltage detection lead and the temperature detection lead are at least partially surrounded and fixed by the insulative body.