The present invention relates to a rechargeable battery including an electrode assembly that performs a charge and discharge action, a case in which the electrode assembly is inserted, a cap plate coupled to an opening of the case, and an electrode terminal in a terminal hole of the cap plate. The electrode terminal includes a plate terminal outside the cap plate and corresponding to the terminal hole, the plate terminal including a through-hole, a first groove, and a second groove, and a rivet terminal, the rivet terminal passing through the terminal hole, being inserted in the through-hole, and being riveted to the plate terminal at an upper end of the rivet terminal. The first groove extends from the through-hole at an upper end side of the rivet terminal, and the second groove extends from the first groove to an outer side of the plate terminal.