A rechargeable battery that includes a case made of a laminate sheet; an electrode assembly installed in the case and an electrode terminal that protrudes outside the case and is connected to the electrode assembly. The case includes a receiving unit receiving the electrode assembly and including a first sealing part, and a cover covering the receiving unit and including a second sealing part that is thermally fused to the first sealing part. The first sealing part and the second sealing part include first protrusions and depressions and second protrusions and depressions respectively formed on a portion corresponding at least to the electrode terminal, and the electrode terminal includes third protrusions and depressions respectively corresponding to the first protrusions and depressions and the second protrusions and depressions.