A battery pack includes a plurality of battery cells, a protective circuit module (PCM), a temperature sensor and a case. Each battery cell has a terrace portion sealed so that an electrode tab of an electrode assembly is extracted to an outside. The PCM is electrically connected to the plurality of battery cells. The temperature sensor is connected to the PCM to measure a temperature of the battery cells. The case accommodates the plurality of battery cells, the PCM and the temperature sensor. The case includes a mounting portion on which the PCM is mounted, and a temperature sensor support portion protruded to be spaced apart from the mounting portion at a predetermined height is formed in one area of the mounting portion.