Disclosed herein is a protection circuit module (PCM) including a protection circuit for controlling overcharge, overdischarge, and overcurrent of a battery, wherein a pair of connection members are attached to the bottom of the PCM, while the connection members are electrically connected to the protection circuit, the connection members being constructed by bending a sheet material into a predetermined shape, to form groove-shaped connection structures into which plate-shaped electrode terminals of a battery cell are inserted and coupled. Each of the connection members includes a lower connection plate, a pair of rear extensions, and front extensions.