A cylindrical secondary battery including a center pin having an improved structure is disclosed. The center pin is disposed into a central opening of an electrode assembly of the cylindrical secondary battery. One end portion of the center pin has a larger diameter than a central opening of an electrode assembly, and the center pin is tapered from the one end portion to another end portion of the center pin. The center pin is forcibly pushed into the central opening of the electrode assembly. Because the center pin is coupled by forced insertion with the central opening of the electrode assembly, movement of the center pin is suppressed and noise generation is prevented.