The present invention relates to a rechargeable battery module. The battery module includes a plurality of unit batteries, a connecting member, and a pressure member. The plurality of unit batteries includes electrode terminals protruded from the unit batteries. The electrode terminals are inserted to a connecting member, and the connecting member includes a fitting portion including a gap on one side of the fitting portion, and a connecting part for connecting the fitting portions while having the gap between the connecting parts. The pressure member compresses the connecting parts so as to narrow a gap between the connecting parts.